APA (7th ed.) Citation

Pratchett, T. (1993). Only you can save mankind (Corgi ed., reprinted.). Transworld Publ.

Chicago Style (17th ed.) Citation

Pratchett, Terry. Only You Can Save Mankind. Corgi ed., reprinted. London [u.a.]: Transworld Publ, 1993.

MLA (9th ed.) Citation

Pratchett, Terry. Only You Can Save Mankind. Corgi ed., reprinted. Transworld Publ, 1993.