KEIGHLEY, M. R. B., & WILLIAMS, N. S. (1999). Surgery of the anus, rectum and colon volume one.--ed.2. W.B. Saunders.
Lua i Stíl Chicago (17ú heag.)KEIGHLEY, Michael R. B., agus Norman S. WILLIAMS. Surgery of the Anus, Rectum and Colon Volume One.--ed.2. London: W.B. Saunders, 1999.
Lua MLA (9ú heag.)KEIGHLEY, Michael R. B., agus Norman S. WILLIAMS. Surgery of the Anus, Rectum and Colon Volume One.--ed.2. W.B. Saunders, 1999.
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