Gaya APA

COTTON, P, B., WILLIAMS, C, B. (2008). Practical gastrointestinal endoscopy: (6th ed.). United Kingdom: Wiley-Balckwell.

Gaya MLA

COTTON, Peter, B.., WILLIAMS, Chistopher, B.. "Practical gastrointestinal endoscopy:". 6th ed. United Kingdom: Wiley-Balckwell, 2008. Buku.