APA (7th ed.) Citation

Pratchett, T. (1989). Sourcery ([Book club ed.].). New American Library.

Chicago Style (17th ed.) Citation

Pratchett, Terry. Sourcery. [Book club ed.]. New York: New American Library, 1989.

MLA (9th ed.) Citation

Pratchett, Terry. Sourcery. [Book club ed.]. New American Library, 1989.