APA aipamena

(2020). Guinness world records 2021. Guinness World Records Limited.

Chicago Style aipamena

Guinness World Records 2021. [London]: Guinness World Records Limited, 2020.

MLA aipamena

Guinness World Records 2021. Guinness World Records Limited, 2020.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.