420 (cannabis culture) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "420 (cannabis culture)" in English language version.

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20web.archive.org

1^st place

7nih.gov

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6doi.org

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5odt.co.nz

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5semanticscholar.org

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4washingtonpost.com

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4usatoday.com

41^st place

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4worldcat.org

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3sfgate.com

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3hightimes.com

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3theguardian.com

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3huffingtonpost.com

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2santacruzsentinel.com

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2books.google.com

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2archive.today

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2globalnews.ca

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2youtube.com

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110daily.com.au

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1crazeco.com.au

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1smh.com.au

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1dopamine.net.au

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1mashable.com

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1junkee.com

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1beat.com.au

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1pedestrian.tv

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1ch9.co.nz

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1marihuanamars.si

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1detaykibris.com

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1kcl.ac.uk

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1mentalfloss.com

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1ktvb.com

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1postbulletin.com

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1thehill.com

476^th place

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1forbes.com

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1apnews.com

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1stylecaster.com

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1spy.com

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1publishersweekly.com

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1reuters.com

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10daily.com.au

"A Giant Cannabis Plant Was Put Up At Martin Place Overnight, Here's Why". 10 daily. April 19, 2019. Retrieved October 23, 2019.

abc7news.com

Amanda del Castillo (April 20, 2019). "Pot enthusiasts in Santa Cruz prepare for 4/20 toker tradition". ABC7 San Francisco. Retrieved April 23, 2020.

apnews.com

Colorado to auction off cannabis-themed license plates, Associated Press, April 13, 2021

archive.org

Chronicle, San Francisco (1962). The San Francisco Chronicle Reader. McGraw-Hill. Retrieved April 22, 2017.

archive.today

"Canada's marijuana activists unite against American-style drug laws – 420 vote mobs to be held in over 10 cities across Canada on April 20th". newswire.ca CNW Group. Archived from the original on September 7, 2012. Retrieved April 20, 2011.
"Pot activists to light up on Hill". Cnews.canoe.ca. Archived from the original on July 12, 2012. Retrieved April 20, 2011.

beat.com.au

"These two weapons covered Sydney in 'cannabis plants' to celebrate 4/20". Beat Magazine. April 20, 2018. Retrieved October 23, 2019.

berkeleyside.com

"Photos: 100s turn up, chill out for 420 day on Cal campus". April 21, 2016. Retrieved October 22, 2020.

books.google.com

High Times (2012). The Official High Times Cannabis Cookbook: More Than 50 Irresistible Recipes That Will Get You High. Chronicle Books. pp. 97–. ISBN 978-1-4521-0133-0. Retrieved April 19, 2012.
Edison, Mike (2009). I Have Fun Everywhere I Go: Savage Tales of Pot, Porn, Punk Rock, Pro Wrestling, Talking Apes, Evil Bosses, Dirty Blues, American Heroes, and the Most Notorious Magazines in the World. Faber & Faber. pp. 207–. ISBN 978-0-86547-903-6. Retrieved April 20, 2013.

broadsheet.com.au

"A Public Cannabis Nursery Appears in Kings Cross". Broadsheet. Retrieved October 23, 2019.

canoe.ca

cnews.canoe.ca

"Pot activists to light up on Hill". Cnews.canoe.ca. Archived from the original on July 12, 2012. Retrieved April 20, 2011.

cbc.ca

Johnson, Lisa (April 20, 2016). "4/20 pot rally draws tens of thousands in Vancouver". CBC News. Retrieved April 20, 2016.

cbsnews.com

Guild, Blair (April 20, 2018). "On 4/20, Sen. Schumer introduces bill to decriminalize marijuana". CBS News. Retrieved April 19, 2019.

ch9.co.nz

"420 Protest". Channel 9 News Dunedin. February 22, 2008. Archived from the original on October 22, 2008. Retrieved October 7, 2008.

chicagotribune.com

Johnson, Gene (April 20, 2017). "How 4/20 ... grew ... into a 'holiday'". chicagotribune.com. Retrieved April 22, 2017.

crazeco.com.au

Collective, Craze (April 20, 2019). "A Giant Cannabis Plant Was Put Up At Martin Place Overnight, Here's Why". Craze Collective. Retrieved September 9, 2022.

curbed.com

ny.curbed.com

Davies, Pete (April 21, 2010). "Washington Square Gets Its Grit Back on 420 Day". Curbed NY. Retrieved January 7, 2018.

dailycamera.com

"Medical marijuana expected to give momentum to CU-Boulder 4/20 event – Boulder Daily Camera". Dailycamera.com. April 9, 2010. Archived from the original on April 30, 2011. Retrieved April 20, 2011.

dailytelegraph.com.au

Briana Domjen; Annette Sharp (April 22, 2014). "Jesse Willesee joins the 420 pro-marijuana movement with a smoking session outside Parliament House". Daily Telegraph.

denverpost.com

theknow.denverpost.com

"Denver's new Mile High 420 Festival announces all-star lineup " Denver Post". denverpost.com. March 8, 2018. Archived from the original on November 20, 2018. Retrieved March 14, 2018.

denverpost.com

"Denver 420 event will be a mix of marijuana politics and celebration". April 19, 2017. Retrieved April 22, 2017.

detaykibris.com

"İşte KKTC'nin uyuşturucu raporu". detaykibris. June 29, 2015. Retrieved April 19, 2019.

digitaljournal.com

"Ottawa's Parliament Hill just one site for planned 4/20 protest". Digitaljournal.com. April 11, 2010. Archived from the original on May 11, 2011. Retrieved April 20, 2011.

doi.org

Staples, John A.; Redelmeier, Donald A. (2018). "The April 20 Cannabis Celebration and Fatal Traffic Crashes in the United States". JAMA Internal Medicine. 178 (4): 569–572. doi:10.1001/jamainternmed.2017.8298. ISSN 2168-6106. PMC 5876802. PMID 29435568.
Vandoros, Sotiris; Kawachi, Ichiro (July 2019). "The relative risk of motor vehicle collision on cannabis celebration day in Great Britain" (PDF). Accident Analysis & Prevention. 128: 248–252. doi:10.1016/j.aap.2019.02.013. PMID 30902341. S2CID 85457198.
Harper, Sam; Palayew, Adam (January 29, 2019). "The annual cannabis holiday and fatal traffic crashes". Injury Prevention. 25 (5): 433–437. doi:10.1136/injuryprev-2018-043068. ISSN 1353-8047. PMID 30696698. S2CID 59413349.
Aydelotte, Jayson D.; Mardock, Alexandra L.; Teixeira, Pedro G.; Brown, Lawrence H. (November 1, 2018). "Re-examining the Association Between '4/20' and Fatal Crashes—Doobie-ous Data?". JAMA Internal Medicine. 178 (11): 1565. doi:10.1001/jamainternmed.2018.5856. PMID 30398555. S2CID 53223889.
Staples, John A.; Redelmeier, Donald A. (March 1, 2019). "Association Between April 20 Cannabis Celebration and Fatal Crashes". JAMA Internal Medicine. 179 (3): 456. doi:10.1001/jamainternmed.2018.8094. PMID 30715145. S2CID 73432259.
Staples, John A; Redelmeier, Donald A (October 2019). "Crashes on cannabis celebration day". Injury Prevention. 25 (5): 476–477. doi:10.1136/injuryprev-2019-043262. PMID 31302609. S2CID 196618121.

dopamine.net.au

Dopamine (April 19, 2018). "Artists hide 'cannabis plants' around Sydney CBD for 420 protest". Dopamine. Retrieved October 23, 2019.

edmontonsun.com

"Hundreds of Tokers Flood Alberta Legislature in Protest to Push for Legalization of Marijuana". April 21, 2013. Retrieved April 22, 2013.

forbes.com

Tom Angell (January 9, 2019). "New Congressional Marijuana Bill Is Actually Numbered H.R. 420". Marijuana Moment – via Forbes.

globalnews.ca

"4/20 celebrations take place at Nathan Phillips Square without permit". April 20, 2018. Retrieved April 20, 2020.
"Thousands expected to attend Toronto 4/20 marijuana rally at Yonge-Dundas Square". April 20, 2017. Retrieved April 20, 2020.

hightimes.com

"Stoner Smart, or Stoner Stupid?". High Times. August 2002. Archived from the original on May 14, 2012. Retrieved April 20, 2012.
Halnon, Karen Bettez (April 11, 2005). "The power of 420". Archived from the original on May 13, 2013.
"#Plantón420 Has Been Camping Outside the Mexican Senate For a Month". March 6, 2020.

huffingtonpost.com

Grim, Ryan (April 20, 2010). "420 Meaning: The True Story Of How April 20 Became 'Weed Day'". The Huffington Post. Retrieved January 23, 2011.
Grim, Ryan (April 20, 2009). "What 420 Means: The True Story Behind Stoners' Favorite Number". The Huffington Post. Archived from the original on January 30, 2014. Retrieved January 23, 2011.

big.assets.huffingtonpost.com

"Wake 'n' Bake!"

junkee.com

"Happy 4/20: Activists Have Hidden Weed Plants All Around Sydney". Junkee. April 20, 2018. Retrieved October 23, 2019.

kcl.ac.uk

kclpure.kcl.ac.uk

Vandoros, Sotiris; Kawachi, Ichiro (July 2019). "The relative risk of motor vehicle collision on cannabis celebration day in Great Britain" (PDF). Accident Analysis & Prevention. 128: 248–252. doi:10.1016/j.aap.2019.02.013. PMID 30902341. S2CID 85457198.

ktvb.com

"Idaho replaces mile marker 420 with 419.9 to thwart stoners". KTVB. Archived from the original on August 20, 2015. Retrieved August 18, 2015.

marihuanamars.si

"Politični Semafor". marihuanamars. March 20, 2018. Archived from the original on September 26, 2020. Retrieved February 3, 2018.

mashable.com

Connellan, Shannon (April 20, 2018). "Marijuana plants hidden in plain sight for 4/20 stunt". Mashable. Retrieved October 23, 2019.

mentalfloss.com

Keyser, Hannah (August 20, 2015). "Stoners Keep Stealing 420 Mile Markers, So Some States Have Replaced Them With 419.9". Mental Floss. Retrieved April 20, 2019.

mvguam.com

Only one shows up for pot bill (July 15, 2010). "Only one shows up for pot bill". Mvguam.com. Archived from the original on July 15, 2015. Retrieved July 15, 2015.

nd.gov

legis.nd.gov

"Bill Actions for HB 1420". nd.gov official portal for North Dakota government. North Dakota legislative branch. Archived from the original on March 26, 2021. Retrieved April 20, 2021.

newdealartregistry.org

Statue by Beniamino Bufano, "Louis Pasteur – 1940". New Deal Art Registry. Retrieved November 16, 2018.

newspapers.com

"Daily Independent Journal from San Rafael, California". November 20, 1954. Retrieved April 22, 2017.

newswire.ca

"Canada's marijuana activists unite against American-style drug laws – 420 vote mobs to be held in over 10 cities across Canada on April 20th". newswire.ca CNW Group. Archived from the original on September 7, 2012. Retrieved April 20, 2011.

nih.gov

pubmed.ncbi.nlm.nih.gov

Staples, John A.; Redelmeier, Donald A. (2018). "The April 20 Cannabis Celebration and Fatal Traffic Crashes in the United States". JAMA Internal Medicine. 178 (4): 569–572. doi:10.1001/jamainternmed.2017.8298. ISSN 2168-6106. PMC 5876802. PMID 29435568.
Vandoros, Sotiris; Kawachi, Ichiro (July 2019). "The relative risk of motor vehicle collision on cannabis celebration day in Great Britain" (PDF). Accident Analysis & Prevention. 128: 248–252. doi:10.1016/j.aap.2019.02.013. PMID 30902341. S2CID 85457198.
Harper, Sam; Palayew, Adam (January 29, 2019). "The annual cannabis holiday and fatal traffic crashes". Injury Prevention. 25 (5): 433–437. doi:10.1136/injuryprev-2018-043068. ISSN 1353-8047. PMID 30696698. S2CID 59413349.
Aydelotte, Jayson D.; Mardock, Alexandra L.; Teixeira, Pedro G.; Brown, Lawrence H. (November 1, 2018). "Re-examining the Association Between '4/20' and Fatal Crashes—Doobie-ous Data?". JAMA Internal Medicine. 178 (11): 1565. doi:10.1001/jamainternmed.2018.5856. PMID 30398555. S2CID 53223889.
Staples, John A.; Redelmeier, Donald A. (March 1, 2019). "Association Between April 20 Cannabis Celebration and Fatal Crashes". JAMA Internal Medicine. 179 (3): 456. doi:10.1001/jamainternmed.2018.8094. PMID 30715145. S2CID 73432259.
Staples, John A; Redelmeier, Donald A (October 2019). "Crashes on cannabis celebration day". Injury Prevention. 25 (5): 476–477. doi:10.1136/injuryprev-2019-043262. PMID 31302609. S2CID 196618121.

ncbi.nlm.nih.gov

Staples, John A.; Redelmeier, Donald A. (2018). "The April 20 Cannabis Celebration and Fatal Traffic Crashes in the United States". JAMA Internal Medicine. 178 (4): 569–572. doi:10.1001/jamainternmed.2017.8298. ISSN 2168-6106. PMC 5876802. PMID 29435568.

nypost.com

"How marijuana's high holiday came to be". New York Post. April 20, 2017. Retrieved April 22, 2017.

nytimes.com

McKinley, Jesse (April 19, 2009). "Marijuana Advocates Point to Signs of Change". The New York Times. Archived from the original on December 18, 2010. Retrieved January 23, 2011.
Jacobs, Julia (January 12, 2019). "Washington State Wants to Stop Theft of Mile 420 Signs. Its Solution? Mile 419.9". The New York Times. ISSN 0362-4331. Retrieved January 13, 2019.

odt.co.nz

Porteous, Debbie (June 12, 2008). "Police swoop on cannabis protest". Otago Daily Times. Retrieved March 31, 2009.
Porteous, Debbie (July 11, 2008). "Campus arrests follow marijuana complaints (+ video)". Otago Daily Times. Retrieved April 22, 2009.
Rudd, Allison (September 26, 2008). "Moore's appeal rejected". Otago Daily Times. Retrieved April 22, 2009.
Rudd, Allison (July 22, 2008). "Lack of quorum foils cannabis vote". Otago Daily Times. Retrieved April 22, 2009.
Rudd, Allison (September 20, 2008). "OUSA general meeting promises controversy". Otago Daily Times. Retrieved April 22, 2009.

osf.io

Harper, Sam; Palayew, Adam (January 29, 2019). "The annual cannabis holiday and fatal traffic crashes". Injury Prevention. 25 (5): 433–437. doi:10.1136/injuryprev-2018-043068. ISSN 1353-8047. PMID 30696698. S2CID 59413349.

pedestrian.tv

"Some Blaze Lord Put A Hydroponic Weed Pop-Up In Sydney's Kings X For 4/20". Pedestrian TV. April 20, 2017. Retrieved October 23, 2019.

postbulletin.com

"County finds fix for missing 420 signs". Post-Bulletin. July 20, 2015. Archived from the original on April 30, 2017. Retrieved July 20, 2015.

publishersweekly.com

Jonathan Segura (May 17, 2016), Cookbooks Previews: June 2016, Publishers Weekly

reuters.com

Hu, Krystal; Sen, Anirban (April 26, 2022). "From weed joke to agreed deal: Inside Musk's $44 bln Twitter buyout". Reuters. Retrieved April 15, 2024.

rollingstone.com

"Does 4/20 Still Matter?". Rolling Stone. Retrieved April 22, 2017.

rtvslo.si

Ma, Al (February 2, 2018). "Bo konoplja kmalu legalizirana?". RTVSLO. Retrieved February 3, 2018.

samesun.com

"420 Day – Cannabis Festival". samesun.com Samesun Nation Travel Blog. Archived from the original on October 22, 2014. Retrieved April 20, 2011.

santacruzsentinel.com

King, Matt (April 24, 2007). "Thousands at UCSC burn one to mark cannabis holiday". Santa Cruz Sentinel. Archived from the original on April 26, 2007.
"Students mark 420 at UC Santa Cruz". Santa Cruz Sentinel. April 21, 2019. Retrieved April 21, 2020.

semanticscholar.org

api.semanticscholar.org

Vandoros, Sotiris; Kawachi, Ichiro (July 2019). "The relative risk of motor vehicle collision on cannabis celebration day in Great Britain" (PDF). Accident Analysis & Prevention. 128: 248–252. doi:10.1016/j.aap.2019.02.013. PMID 30902341. S2CID 85457198.
Harper, Sam; Palayew, Adam (January 29, 2019). "The annual cannabis holiday and fatal traffic crashes". Injury Prevention. 25 (5): 433–437. doi:10.1136/injuryprev-2018-043068. ISSN 1353-8047. PMID 30696698. S2CID 59413349.
Aydelotte, Jayson D.; Mardock, Alexandra L.; Teixeira, Pedro G.; Brown, Lawrence H. (November 1, 2018). "Re-examining the Association Between '4/20' and Fatal Crashes—Doobie-ous Data?". JAMA Internal Medicine. 178 (11): 1565. doi:10.1001/jamainternmed.2018.5856. PMID 30398555. S2CID 53223889.
Staples, John A.; Redelmeier, Donald A. (March 1, 2019). "Association Between April 20 Cannabis Celebration and Fatal Crashes". JAMA Internal Medicine. 179 (3): 456. doi:10.1001/jamainternmed.2018.8094. PMID 30715145. S2CID 73432259.
Staples, John A; Redelmeier, Donald A (October 2019). "Crashes on cannabis celebration day". Injury Prevention. 25 (5): 476–477. doi:10.1136/injuryprev-2019-043262. PMID 31302609. S2CID 196618121.

sfcitizen.com

"A Huge Turn Out for 420 Day on Hippie Hill in San Francisco's Golden Gate Park " San Francisco Citizen". Sfcitizen.com. April 20, 2010. Archived from the original on April 30, 2011. Retrieved April 20, 2011.

sfgate.com

"Stoner Chic Traces Origin To San Rafael – Snickering high schoolers brought '420' into lexicon". San Francisco Chronicle. April 20, 2000. Retrieved April 4, 2012.
Alyssa Pereira (April 20, 2016). "Local originators of term 420 solve 45-year-old mystery". San Francisco Chronicle.
Lester Black (April 17, 2023). "The Bay Area origins of '420' are full of controversy". SFGATE. Hearst Communications.

shoutwiki.com

cannabis.shoutwiki.com

"420 event lists".

smh.com.au

"Thousands gather for 'Weed Day' in Melbourne". The Sydney Morning Herald. April 21, 2017. Retrieved October 23, 2019.

snopes.com

"The Origins of 420". September 14, 2002.

spy.com

Naima Karp; Destynee Powell (November 8, 2018), "Celebrate the High Holy Day With These Celebrated Marijuana Cookbooks", spy.com, Penske Media

stltoday.com

David Carson; Christine Tannous (April 20, 2023). "Photos: St. Louis celebrates first '4/20 Day' since recreational marijuana became legal in Missouri". St. Louis Post-Dispatch.

straight.com

"Marijuana protest planned for the Vancouver Art Gallery despite 4/20 moving to Sunset Beach". April 19, 2016.

stylecaster.com

Maggie GRISWOLD (April 14, 2020). "The Best 4/20 Cookbooks for When You Have a Case of the Munchies". Stylecaster. SHE Media.

theguardian.com

Gayle, Damien (April 19, 2015). "Thousands of cannabis users roll up in Hyde Park for annual 4/20 event". The Guardian. Archived from the original on February 27, 2017. Retrieved April 22, 2017.
Gayle, Damien (April 21, 2016). "Police make 20 arrests at cannabis picnic in London's Hyde Park". the Guardian. Retrieved May 5, 2016.
Paul, Kari; McCormick, Erin (February 3, 2023). "Jury sides with Elon Musk over 2018 tweets claiming he would take Tesla private". The Guardian. ISSN 0261-3077. Retrieved February 4, 2023.

thehill.com

Gstalter, Morgan (June 28, 2018). "Schumer unveils bill to decriminalize marijuana". The Hill. Retrieved April 19, 2019.

time.com

Olivia B. Waxman (April 19, 2017). "What the Guys Who Coined '420' Think About Their Place in Marijuana History". Time. Archived from the original on April 20, 2017. Retrieved April 20, 2017.

torontosun.com

"Annual 420 pot rally will be more celebration than protest: Organizers". Toronto Sun. Retrieved April 22, 2017.

usatoday.com

"Marijuana's big day is here: '420' celebrations ready to roll". USA Today. Retrieved April 22, 2017.
Estepa, Jessica (April 19, 2017). "D.C. activists to hand out joints near U.S. Capitol on 4/20". USA Today. Retrieved April 20, 2022.
"State alters 420 MM sign to thwart thieves". USA Today. Retrieved April 18, 2018.
Kelly Keiter (August 26, 2015). "Officials say theft of '420' road signs no laughing matter". Salt Lake City: KSTU.

washingtonpost.com

McCoy, Terrence (April 18, 2014). "The strange story of how the pot holiday '4/20' got its name". The Washington Post. Retrieved April 18, 2020.
Stein, Perry (April 20, 2015). "D.C. residents and activists light up on the National Mall for 4/20". The Washington Post. Retrieved April 20, 2022.
Ingraham, Christopher (August 20, 2015). "A map of the remaining 420-mile markers in the U.S." Washington Post. Retrieved April 20, 2019.
"D.C. mayor offers pot activist Tag 420 for his efforts". Washington Post.

wcvb.com

Reed, Matt (April 20, 2018), Boston celebrates 4/20, retrieved April 20, 2021

web.archive.org

King, Matt (April 24, 2007). "Thousands at UCSC burn one to mark cannabis holiday". Santa Cruz Sentinel. Archived from the original on April 26, 2007.
McKinley, Jesse (April 19, 2009). "Marijuana Advocates Point to Signs of Change". The New York Times. Archived from the original on December 18, 2010. Retrieved January 23, 2011.
Grim, Ryan (April 20, 2009). "What 420 Means: The True Story Behind Stoners' Favorite Number". The Huffington Post. Archived from the original on January 30, 2014. Retrieved January 23, 2011.
Olivia B. Waxman (April 19, 2017). "What the Guys Who Coined '420' Think About Their Place in Marijuana History". Time. Archived from the original on April 20, 2017. Retrieved April 20, 2017.
"Stoner Smart, or Stoner Stupid?". High Times. August 2002. Archived from the original on May 14, 2012. Retrieved April 20, 2012.
Halnon, Karen Bettez (April 11, 2005). "The power of 420". Archived from the original on May 13, 2013.
Gayle, Damien (April 19, 2015). "Thousands of cannabis users roll up in Hyde Park for annual 4/20 event". The Guardian. Archived from the original on February 27, 2017. Retrieved April 22, 2017.
"A Huge Turn Out for 420 Day on Hippie Hill in San Francisco's Golden Gate Park " San Francisco Citizen". Sfcitizen.com. April 20, 2010. Archived from the original on April 30, 2011. Retrieved April 20, 2011.
Hall, Neal (May 2, 2009). "Thousands of marijuana smokers gather in Vancouver to celebrate "420"". The Vancouver Sun. Archived from the original on September 10, 2014. Retrieved September 30, 2009.
"420 Day – Cannabis Festival". samesun.com Samesun Nation Travel Blog. Archived from the original on October 22, 2014. Retrieved April 20, 2011.
"Denver's new Mile High 420 Festival announces all-star lineup " Denver Post". denverpost.com. March 8, 2018. Archived from the original on November 20, 2018. Retrieved March 14, 2018.
"Ottawa's Parliament Hill just one site for planned 4/20 protest". Digitaljournal.com. April 11, 2010. Archived from the original on May 11, 2011. Retrieved April 20, 2011.
CU's 4/20 pot smoke-out draws crowd of 10,000 : CU News.
"Medical marijuana expected to give momentum to CU-Boulder 4/20 event – Boulder Daily Camera". Dailycamera.com. April 9, 2010. Archived from the original on April 30, 2011. Retrieved April 20, 2011.
"420 Protest". Channel 9 News Dunedin. February 22, 2008. Archived from the original on October 22, 2008. Retrieved October 7, 2008.
"Politični Semafor". marihuanamars. March 20, 2018. Archived from the original on September 26, 2020. Retrieved February 3, 2018.
"Idaho replaces mile marker 420 with 419.9 to thwart stoners". KTVB. Archived from the original on August 20, 2015. Retrieved August 18, 2015.
"County finds fix for missing 420 signs". Post-Bulletin. July 20, 2015. Archived from the original on April 30, 2017. Retrieved July 20, 2015.
Only one shows up for pot bill (July 15, 2010). "Only one shows up for pot bill". Mvguam.com. Archived from the original on July 15, 2015. Retrieved July 15, 2015.
"Bill Actions for HB 1420". nd.gov official portal for North Dakota government. North Dakota legislative branch. Archived from the original on March 26, 2021. Retrieved April 20, 2021.

wiki4weed.com

Hall, Neal (May 2, 2009). "Thousands of marijuana smokers gather in Vancouver to celebrate "420"". The Vancouver Sun. Archived from the original on September 10, 2014. Retrieved September 30, 2009.

worldcat.org

search.worldcat.org

Staples, John A.; Redelmeier, Donald A. (2018). "The April 20 Cannabis Celebration and Fatal Traffic Crashes in the United States". JAMA Internal Medicine. 178 (4): 569–572. doi:10.1001/jamainternmed.2017.8298. ISSN 2168-6106. PMC 5876802. PMID 29435568.
Harper, Sam; Palayew, Adam (January 29, 2019). "The annual cannabis holiday and fatal traffic crashes". Injury Prevention. 25 (5): 433–437. doi:10.1136/injuryprev-2018-043068. ISSN 1353-8047. PMID 30696698. S2CID 59413349.
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