APA (7th ed.) Citation

(1993). When did it happen?: A question and answer book about world history. Rainbow Books.

Chicago Style (17th ed.) Citation

When Did It Happen?: A Question and Answer Book About World History. London: Rainbow Books, 1993.

MLA (9th ed.) Citation

When Did It Happen?: A Question and Answer Book About World History. Rainbow Books, 1993.

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