Cita APA (7a ed.)

Cope, Z., & Silen, W. (1991). Cope's early diagnosis of the acute abdomen (18th ed. / revised by William Silen.). Oxford University Press.

Cita Chicago Style (17a ed.)

Cope, Zachary, y William Silen. Cope's Early Diagnosis of the Acute Abdomen. 18th ed. / revised by William Silen. New York [etc.]: Oxford University Press, 1991.

Cita MLA (9a ed.)

Cope, Zachary, y William Silen. Cope's Early Diagnosis of the Acute Abdomen. 18th ed. / revised by William Silen. Oxford University Press, 1991.