Dyfyniad APA

(2016). Guinness world records 2017. London: Guinness World Records Limited.

Dyfyniad Arddull Chicago

Guinness World Records 2017. London: Guinness World Records Limited, 2016.

Dyfyniad MLA

Guinness World Records 2017. London: Guinness World Records Limited, 2016.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.