Cita APA (7a ed.)

Keighley, M. R., & Williams, N. S. (1993). Surgery of the anus, rectum and colon. Saunders.

Cita Chicago Style (17a ed.)

Keighley, Michael R.B, y Norman S. Williams. Surgery of the Anus, Rectum and Colon. London [etc.]: Saunders, 1993.

Cita MLA (9a ed.)

Keighley, Michael R.B, y Norman S. Williams. Surgery of the Anus, Rectum and Colon. Saunders, 1993.