Keighley, M. R. B., & Williams, N. S. (1993). Surgery of the anus, rectum and colon: Michael R. B. Keighley, Norman S. Williams. W. B. Saunders.
Lua i Stíl Chicago (17ú heag.)Keighley, Michael R. B., agus Norman S. Williams. Surgery of the Anus, Rectum and Colon: Michael R. B. Keighley, Norman S. Williams. London [u.a.]: W. B. Saunders, 1993.
Lua MLA (8ú heag.)Keighley, Michael R. B., agus Norman S. Williams. Surgery of the Anus, Rectum and Colon: Michael R. B. Keighley, Norman S. Williams. W. B. Saunders, 1993.
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