APA (7th ed.) Citation

Pratchett, T. (1981). Strata ([Book Club ed.].). St. Martin's Press.

Chicago Style (17th ed.) Citation

Pratchett, Terry. Strata. [Book Club ed.]. New York: St. Martin's Press, 1981.

MLA (8th ed.) Citation

Pratchett, Terry. Strata. [Book Club ed.]. St. Martin's Press, 1981.