APA
Robert M. Zollinger, . (1980). The American Journal of Surgery. New York: Technical Publishing.
Chicago
Robert M. Zollinger, . 1980. The American Journal of Surgery. New York: Technical Publishing.
Harvard
Robert M. Zollinger, . (1980). The American Journal of Surgery. New York: Technical Publishing.
MLA
Robert M. Zollinger, . The American Journal of Surgery. New York: Technical Publishing. 1980.