Gaya APA

Nyhus, L, M., Wastell, C. (1986). Surgery of the Stomach and Duodenum (4th ed). Boston: Little, Brown and Company.

Gaya MLA

Nyhus, Lloyd, M., Wastell, Christopher. "Surgery of the Stomach and Duodenum". 4th ed Boston: Little, Brown and Company, 1986. print.