APA (7th ed.) Citation

(2007). An unofficial companion to the novels of Terry Pratchett (1. publ.). Greenwood World Publ.

Chicago Style (17th ed.) Citation

An Unofficial Companion to the Novels of Terry Pratchett. 1. publ. Oxford [u.a.]: Greenwood World Publ, 2007.

MLA (9th ed.) Citation

An Unofficial Companion to the Novels of Terry Pratchett. 1. publ. Greenwood World Publ, 2007.

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