APA (7th ed.) Citation

(1990). The Guiness enyclopedia. Guiness Publishing.

Chicago Style (17th ed.) Citation

The Guiness Enyclopedia. Great Britain: Guiness Publishing, 1990.

MLA (9th ed.) Citation

The Guiness Enyclopedia. Guiness Publishing, 1990.

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