Citazione Stile APA (7a Edizione)

KEIGHLEY, M. R. B., & WILLIAMS, N. S. (1999). Surgery of the anus, rectum and colon volume two.--ed.2. W.B. Saunders.

Citazione stile Chigago Style (17a edizione)

KEIGHLEY, Michael R. B., e Norman S. WILLIAMS. Surgery of the Anus, Rectum and Colon Volume Two.--ed.2. London: W.B. Saunders, 1999.

Citatione MLA (9a ed.)

KEIGHLEY, Michael R. B., e Norman S. WILLIAMS. Surgery of the Anus, Rectum and Colon Volume Two.--ed.2. W.B. Saunders, 1999.