APA (7th ed.) Citation

Pratchett, T., Stewart, I., & Cohen, J. (2014). The Science of Discworld (First Anchor Books edition.). Anchor.

Chicago Style (17th ed.) Citation

Pratchett, Terry, Ian Stewart, and Jack Cohen. The Science of Discworld. First Anchor Books edition. New York: Anchor, 2014.

MLA (9th ed.) Citation

Pratchett, Terry, et al. The Science of Discworld. First Anchor Books edition. Anchor, 2014.