APA (7th ed.) Citation

Pratchett, T., & Baxter, S. (2012). The long earth / Terry Pratchett and Stephen Baxter. Doubleday.

Chicago Style (17th ed.) Citation

Pratchett, Terry, and Stephen Baxter. The Long Earth / Terry Pratchett and Stephen Baxter. London: Doubleday, 2012.

MLA (9th ed.) Citation

Pratchett, Terry, and Stephen Baxter. The Long Earth / Terry Pratchett and Stephen Baxter. Doubleday, 2012.

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