APA (7th ed.) Citation

Turtledove, H. (2002). American empire--the center cannot hold. Del Rey/Ballantine Books.

Chicago Style (17th ed.) Citation

Turtledove, Harry. American Empire--the Center Cannot Hold. New York: Del Rey/Ballantine Books, 2002.

MLA (9th ed.) Citation

Turtledove, Harry. American Empire--the Center Cannot Hold. Del Rey/Ballantine Books, 2002.