Dyfyniad APA

(1989). Principles of surgery (5th ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Principles of Surgery. 5th ed. New York: McGraw-Hill, 1989.

Dyfyniad MLA

Principles of Surgery. 5th ed. McGraw-Hill, 1989.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.