APA (7th ed.) Citation

Officially. (2017). Guinness World Records 2017. Officially Amazing.

Chicago Style (17th ed.) Citation

Officially. Guinness World Records 2017. UK: Officially Amazing, 2017.

MLA (9th ed.) Citation

Officially. Guinness World Records 2017. Officially Amazing, 2017.

Warning: These citations may not always be 100% accurate.