Dyfyniad APA
Guinness World Records Limited. (2010). Guinness world records 2011. Guinness World Records.
Dyfyniad Arddull Chicago
Guinness World Records Limited. Guinness World Records 2011. London: Guinness World Records, 2010.
Dyfyniad MLA
Guinness World Records Limited. Guinness World Records 2011. Guinness World Records, 2010.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.