Review: The Simpsons - Once Upon a Time in Springfield. archive.ph [online]. 2013-02-05 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2013-02-05.
archive.today
Review: The Simpsons - Once Upon a Time in Springfield. archive.ph [online]. 2013-02-05 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2013-02-05.
avclub.com
"Once Upon a Time in Springfield"/The Simpsons 20th Anniversay Special in 3-D on Ice/"Love Rollercoaster". The A.V. Club [online]. 2010-01-11 [cit. 2022-05-27]. Dostupné online. (anglicky)
dallasnews.com
'The Simpsons' celebrates 20 years with 450th episode | Dallas-Fort Worth Entertainment News and Events | News for Dallas, Texas | Dallas Morning News. web.archive.org [online]. 2010-05-11 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2010-05-11.
emmys.com
The Simpsons. Television Academy [online]. [cit. 2022-05-27]. Dostupné online. (anglicky)
etonline.com
New Video: Anne Hathaway Guests On 'The Simpsons'. web.archive.org [online]. 2009-06-24 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2009-06-24.
ew.com
hollywoodinsider.ew.com
‘The Simpsons’: Coldplay’s Chris Martin, Sarah Silverman among season 21 guests | EW.com. web.archive.org [online]. 2009-07-26 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2009-07-26.
firefox.org
Review -- The Simpsons: "Once Upon a Time in Springfield". web.archive.org [online]. 2010-06-15 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2010-06-15.
fox.com
Fox Broadcasting Company: Upfront: Programming Schedule. web.archive.org [online]. 2009-05-23 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2009-05-23.
ign.com
CANNING, Robert. The Simpsons: "Once Upon a Time in Springfield" Review. IGN [online]. 2010-01-11 [cit. 2022-05-27]. Dostupné online. (anglicky)
tvbythenumbers.com
TV Ratings Sunday: Football Overrun Boosts Gigantic Simpsons; Chuck Premieres Up. web.archive.org [online]. 2010-03-15 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2012-10-28.
TV Ratings: Pro and College Football and The Simpsons and NCIS top weekly viewing. web.archive.org [online]. 2010-01-15 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2010-01-15.
tvfanatic.com
HOCHBERGER, Eric. The Simpsons Review: "Once Upon a Time in Springfield". TV Fanatic [online]. 2010-01-11 [cit. 2022-05-27]. Dostupné online. (anglicky)
‘The Simpsons’: Coldplay’s Chris Martin, Sarah Silverman among season 21 guests | EW.com. web.archive.org [online]. 2009-07-26 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2009-07-26.
Fox Broadcasting Company: Upfront: Programming Schedule. web.archive.org [online]. 2009-05-23 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2009-05-23.
New Video: Anne Hathaway Guests On 'The Simpsons'. web.archive.org [online]. 2009-06-24 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2009-06-24.
Review -- The Simpsons: "Once Upon a Time in Springfield". web.archive.org [online]. 2010-06-15 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2010-06-15.
TV Ratings Sunday: Football Overrun Boosts Gigantic Simpsons; Chuck Premieres Up. web.archive.org [online]. 2010-03-15 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2012-10-28.
TV Ratings: Pro and College Football and The Simpsons and NCIS top weekly viewing. web.archive.org [online]. 2010-01-15 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2010-01-15.
'The Simpsons' celebrates 20 years with 450th episode | Dallas-Fort Worth Entertainment News and Events | News for Dallas, Texas | Dallas Morning News. web.archive.org [online]. 2010-05-11 [cit. 2022-05-27]. Dostupné v archivu pořízeném z originálu dne 2010-05-11.
