APA (7th ed.) Citation

(2000). The guinness book of the 20th century (millenium ed.). Guinness.

Chicago Style (17th ed.) Citation

The Guinness Book of the 20th Century. millenium ed. London: Guinness, 2000.

MLA (9th ed.) Citation

The Guinness Book of the 20th Century. millenium ed. Guinness, 2000.

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