APA (7th ed.) Citation

Turtledove, H. (2002). Worlds that weren't. ROC.

Chicago Style (17th ed.) Citation

Turtledove, Harry. Worlds That Weren't. New York: ROC, 2002.

MLA (9th ed.) Citation

Turtledove, Harry. Worlds That Weren't. ROC, 2002.

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