APA (7th ed.) Citation

Turtledove, H. (2004). Gunpowder empire: Crosstime traffic-book one. A Tom Doherty Associates Book.

Chicago Style (17th ed.) Citation

Turtledove, Harry. Gunpowder Empire: Crosstime Traffic-book One. New York: A Tom Doherty Associates Book, 2004.

MLA (9th ed.) Citation

Turtledove, Harry. Gunpowder Empire: Crosstime Traffic-book One. A Tom Doherty Associates Book, 2004.

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