Hello Katy Tour (English Wikipedia)

Harding, Cortney (11 February 2009). "Katy Perry: Single Lady". Billboard. Archived from the original on 5 December 2025. Retrieved 5 December 2025.

hurricane.de (Global: low place; English: low place)

"Katy Perry". Hurricane Festival (in German). Archived from the original on April 13, 2009. Retrieved March 3, 2009.

katyperry.com (Global: low place; English: low place)

"Events". katyperry.com. Archived from the original on February 28, 2009. Retrieved March 3, 2009.

livedaily.com (Global: low place; English: 9,193^rd place)

Kilgore, Kym (November 11, 2008). "Katy Perry takes 'Boys' along on headlining outing". liveDaily. Archived from the original on February 2, 2009. Retrieved March 3, 2009.

minneapolisfed.org (Global: 2,255^th place; English: 1,024^th place)

1634–1699: McCusker, J. J. (1997). How Much Is That in Real Money? A Historical Price Index for Use as a Deflator of Money Values in the Economy of the United States: Addenda et Corrigenda (PDF). American Antiquarian Society. 1700–1799: McCusker, J. J. (1992). How Much Is That in Real Money? A Historical Price Index for Use as a Deflator of Money Values in the Economy of the United States (PDF). American Antiquarian Society. 1800–present: Federal Reserve Bank of Minneapolis. "Consumer Price Index (estimate) 1800–". Retrieved February 29, 2024.

nbc13.com (Global: low place; English: low place)

Carter, Don (February 27, 2009). "2009 Schaeffer Eye Center Crawfish Boil Lineup". WVTM. Birmingham Broadcasting (WVTM-TV), Inc. Retrieved February 28, 2009.^{[permanent dead link]}

nme.com (Global: 142^nd place; English: 95^th place)

"Katy Perry announces lengthy North American tour". NME. November 11, 2008. Archived from the original on August 3, 2017. Retrieved November 11, 2008.

ocregister.com (Global: 1,379^th place; English: 673^rd place)

"Katy Perry is not just for kids at the Wiltern". The Orange County Register. February 1, 2009. Archived from the original on September 28, 2013. Retrieved September 25, 2013.

oxegen.ie (Global: low place; English: low place)

"Line Up". Oxegen Festival. Archived from the original on February 28, 2009. Retrieved March 3, 2009.

pinkpop.nl (Global: low place; English: low place)

"Katy Perry". Pinkpop 2009. Archived from the original on March 9, 2009. Retrieved March 10, 2009.

rockwerchter.be (Global: low place; English: low place)

"Katy Perry". Rock Werchter. Archived from the original on March 8, 2009. Retrieved March 3, 2009.

seventeen.com (Global: 4,061^st place; English: 2,878^th place)

"10 Reasons We Heart Katy Perry (Especially in Concert!)". Seventeen. April 9, 2009. Archived from the original on November 23, 2012. Retrieved September 25, 2013.

southside.de (Global: low place; English: low place)

"Katy Perry". Southside Festival (in German). Archived from the original on April 9, 2009. Retrieved March 3, 2009.

thedinah.com (Global: low place; English: low place)

"White Diamond Party". Club Skirts. Archived from the original on February 26, 2009. Retrieved March 12, 2009.

tinthepark.com (Global: low place; English: low place)

"2009 Line Up". T in the Park 2009. Archived from the original on February 28, 2009. Retrieved March 3, 2009.

twitter.com (Global: 43^rd place; English: 43^rd place)

Perry, Katy [@katyperry] (August 30, 2009). "A million followers! Does that mean i hv 2b responsible w/my tweets now? Boring! Can't promise that! Specially it being last night of tour!" (Tweet). Retrieved August 17, 2026 – via Twitter.
Perry, Katy [@katyperry] (August 31, 2009). "I love santa barbara. I will be married and buried on and in this soil. THANK YOU HELLO KATY FRIENDS. It's been a magical tour" (Tweet). Retrieved August 17, 2026 – via Twitter.

u18.es (Global: low place; English: low place)

"¡Lo Que Te Espera!". Under Eighteen (in Spanish). Archived from the original on April 22, 2009. Retrieved May 9, 2009.
"¡Lo Que Te Espera!". Under Eighteen (in Spanish). Archived from the original on April 22, 2009. Retrieved May 9, 2009.

variety.com (Global: 21^st place; English: 17^th place)

"Review: "Katy Perry"". Variety. January 31, 2009. Archived from the original on March 17, 2014. Retrieved September 25, 2013.

vcstar.com (Global: 5,685^th place; English: 2,885^th place)

Hernandez, Marjorie (August 31, 2009). "Coming home to S.B., Perry bids farewell to 'Hello Katy Tour'". Ventura County Star. Archived from the original on October 5, 2013. Retrieved October 15, 2013.

vfestival.com (Global: low place; English: low place)

"2009 Line Up". V Festival 2009. Archived from the original on September 28, 2009. Retrieved March 3, 2009.

vnuemedia.com (Global: low place; English: low place)

login.vnuemedia.com

"Billboard Boxscore". Billboard. March 7, 2009. Retrieved March 21, 2009.^{[dead link]}
"Billboard Boxscore". Billboard. February 28, 2009. Retrieved March 21, 2009.^{[dead link]}
"Billboard Boxscore". Billboard. May 3, 2009. Retrieved May 9, 2009.^{[dead link]}

web.archive.org (Global: 1^st place; English: 1^st place)

"Katy Perry announces lengthy North American tour". NME. November 11, 2008. Archived from the original on August 3, 2017. Retrieved November 11, 2008.
Harding, Cortney (11 February 2009). "Katy Perry: Single Lady". Billboard. Archived from the original on 5 December 2025. Retrieved 5 December 2025.
Hernandez, Marjorie (August 31, 2009). "Coming home to S.B., Perry bids farewell to 'Hello Katy Tour'". Ventura County Star. Archived from the original on October 5, 2013. Retrieved October 15, 2013.
"Katy Perry is not just for kids at the Wiltern". The Orange County Register. February 1, 2009. Archived from the original on September 28, 2013. Retrieved September 25, 2013.
"Review: "Katy Perry"". Variety. January 31, 2009. Archived from the original on March 17, 2014. Retrieved September 25, 2013.
"10 Reasons We Heart Katy Perry (Especially in Concert!)". Seventeen. April 9, 2009. Archived from the original on November 23, 2012. Retrieved September 25, 2013.
"Events". katyperry.com. Archived from the original on February 28, 2009. Retrieved March 3, 2009.
Kilgore, Kym (November 11, 2008). "Katy Perry takes 'Boys' along on headlining outing". liveDaily. Archived from the original on February 2, 2009. Retrieved March 3, 2009.
"White Diamond Party". Club Skirts. Archived from the original on February 26, 2009. Retrieved March 12, 2009.
"Katy Perry". Pinkpop 2009. Archived from the original on March 9, 2009. Retrieved March 10, 2009.
"Katy Perry". Hurricane Festival (in German). Archived from the original on April 13, 2009. Retrieved March 3, 2009.
"Katy Perry". Southside Festival (in German). Archived from the original on April 9, 2009. Retrieved March 3, 2009.
"¡Lo Que Te Espera!". Under Eighteen (in Spanish). Archived from the original on April 22, 2009. Retrieved May 9, 2009.
"¡Lo Que Te Espera!". Under Eighteen (in Spanish). Archived from the original on April 22, 2009. Retrieved May 9, 2009.
"Katy Perry". Rock Werchter. Archived from the original on March 8, 2009. Retrieved March 3, 2009.
"2009 Line Up". T in the Park 2009. Archived from the original on February 28, 2009. Retrieved March 3, 2009.
"Line Up". Oxegen Festival. Archived from the original on February 28, 2009. Retrieved March 3, 2009.
"2009 Line Up". V Festival 2009. Archived from the original on September 28, 2009. Retrieved March 3, 2009.

Hello Katy Tour (English Wikipedia)

americanantiquarian.org (Global: 1,217th place; English: 526th place)

billboard.com (Global: 20th place; English: 13th place)

hurricane.de (Global: low place; English: low place)

katyperry.com (Global: low place; English: low place)

livedaily.com (Global: low place; English: 9,193rd place)

minneapolisfed.org (Global: 2,255th place; English: 1,024th place)

nbc13.com (Global: low place; English: low place)

nme.com (Global: 142nd place; English: 95th place)

ocregister.com (Global: 1,379th place; English: 673rd place)

oxegen.ie (Global: low place; English: low place)

pinkpop.nl (Global: low place; English: low place)

rockwerchter.be (Global: low place; English: low place)

seventeen.com (Global: 4,061st place; English: 2,878th place)

southside.de (Global: low place; English: low place)

thedinah.com (Global: low place; English: low place)

tinthepark.com (Global: low place; English: low place)

twitter.com (Global: 43rd place; English: 43rd place)

u18.es (Global: low place; English: low place)

variety.com (Global: 21st place; English: 17th place)

vcstar.com (Global: 5,685th place; English: 2,885th place)

vfestival.com (Global: low place; English: low place)

vnuemedia.com (Global: low place; English: low place)

login.vnuemedia.com

web.archive.org (Global: 1st place; English: 1st place)

americanantiquarian.org (Global: 1,217^th place; English: 526^th place)

billboard.com (Global: 20^th place; English: 13^th place)

livedaily.com (Global: low place; English: 9,193^rd place)

minneapolisfed.org (Global: 2,255^th place; English: 1,024^th place)

nme.com (Global: 142^nd place; English: 95^th place)

ocregister.com (Global: 1,379^th place; English: 673^rd place)

seventeen.com (Global: 4,061^st place; English: 2,878^th place)

twitter.com (Global: 43^rd place; English: 43^rd place)

variety.com (Global: 21^st place; English: 17^th place)

vcstar.com (Global: 5,685^th place; English: 2,885^th place)

web.archive.org (Global: 1^st place; English: 1^st place)