APA (7th ed.) Citation

Pratchett, T., & Baxter, S. (2012). The long Earth (1st U.S. ed.). HarperCollins.

Chicago Style (17th ed.) Citation

Pratchett, Terry, and Stephen Baxter. The Long Earth. 1st U.S. ed. New York: HarperCollins, 2012.

MLA (9th ed.) Citation

Pratchett, Terry, and Stephen Baxter. The Long Earth. 1st U.S. ed. HarperCollins, 2012.