The Official High Times Cannabis Cookbook: More Than 50 Irresistible Recipes That Will Get You High.Chronicle Books, ISBN 978-1-4521-0133-0, S. 97.
Mike Edison: 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 ISBN 978-0-86547-903-6, S. 207, books.google.com.
cbc.ca
Lisa Johnson: 4/20 pot rally draws tens of thousands in Vancouver. In: CBC News. 20. April 2016 (Online [abgerufen am 20. April 2016]).
Jesse McKinley: Marijuana Advocates Point to Signs of Change. In: The New York Times. 19. April 2009, archiviert vom Original am 20. Januar 2011; abgerufen am 23. Januar 2011 (Mr. Hager said the significance of April 20 dates to a ritual begun in the early 1970s in which a group of Northern California teenagers smoked cannabis every day at 4:20 p.m. Word of the ritual spread and expanded to a yearly event in various places. Soon, cannabis aficionados were using "420" as a code for smoking and using it as a sign-off on flyers for concerts where the drug would be plentiful. In recent years, the April 20 events have become so widespread that several colleges have discouraged students from participating.).
Jesse McKinley: Marijuana Advocates Point to Signs of Change. In: The New York Times. 19. April 2009, archiviert vom Original am 20. Januar 2011; abgerufen am 23. Januar 2011 (englisch, Mr. Hager said the significance of April 20 dates to a ritual begun in the early 1970s in which a group of Northern California teenagers smoked cannabis every day at 4:20 p.m. Word of the ritual spread and expanded to a yearly event in various places. Soon, cannabis aficionados were using "420" as a code for smoking and using it as a sign-off on flyers for concerts where the drug would be plentiful. In recent years, the April 20 events have become so widespread that several colleges have discouraged students from participating.).
420 Day- Cannabis Festival. Samesun Nation Travel Blog, 16. April 2011, archiviert vom Original am 4. Oktober 2011; abgerufen am 14. August 2011 (englisch).
Genevieve Bookwalter: Mom and Dad now know about '4/20'. In: Santa Cruz Sentinel. 7. April 2009, archiviert vom Original am 10. April 2009; abgerufen am 20. April 2013.
420 Protest. In: Channel 9 News Dunedin. 22. Februar 2008, archiviert vom Original am 22. Oktober 2008; abgerufen am 7. Oktober 2008 (englisch).
Jesse McKinley: Marijuana Advocates Point to Signs of Change. In: The New York Times. 19. April 2009, archiviert vom Original am 20. Januar 2011; abgerufen am 23. Januar 2011 (Mr. Hager said the significance of April 20 dates to a ritual begun in the early 1970s in which a group of Northern California teenagers smoked cannabis every day at 4:20 p.m. Word of the ritual spread and expanded to a yearly event in various places. Soon, cannabis aficionados were using "420" as a code for smoking and using it as a sign-off on flyers for concerts where the drug would be plentiful. In recent years, the April 20 events have become so widespread that several colleges have discouraged students from participating.).
Jesse McKinley: Marijuana Advocates Point to Signs of Change. In: The New York Times. 19. April 2009, archiviert vom Original am 20. Januar 2011; abgerufen am 23. Januar 2011 (englisch, Mr. Hager said the significance of April 20 dates to a ritual begun in the early 1970s in which a group of Northern California teenagers smoked cannabis every day at 4:20 p.m. Word of the ritual spread and expanded to a yearly event in various places. Soon, cannabis aficionados were using "420" as a code for smoking and using it as a sign-off on flyers for concerts where the drug would be plentiful. In recent years, the April 20 events have become so widespread that several colleges have discouraged students from participating.).
420 Day- Cannabis Festival. Samesun Nation Travel Blog, 16. April 2011, archiviert vom Original am 4. Oktober 2011; abgerufen am 14. August 2011 (englisch).
Genevieve Bookwalter: Mom and Dad now know about '4/20'. In: Santa Cruz Sentinel. 7. April 2009, archiviert vom Original am 10. April 2009; abgerufen am 20. April 2013.
420 Protest. In: Channel 9 News Dunedin. 22. Februar 2008, archiviert vom Original am 22. Oktober 2008; abgerufen am 7. Oktober 2008 (englisch).
