APA (7th ed.) Citation
Guinness World Records Limited. (2010). Guinness world records 2011. Guinness World Records.
Chicago Style (17th ed.) Citation
Guinness World Records Limited. Guinness World Records 2011. London: Guinness World Records, 2010.
MLA (9th ed.) Citation
Guinness World Records Limited. Guinness World Records 2011. Guinness World Records, 2010.
Warning: These citations may not always be 100% accurate.