Cita APA (7a ed.)

Bockus, H. L., & Berk, J. E. (1976). Gastroenterology (3rd ed.). Saunders.

Cita Chicago Style (17a ed.)

Bockus, Henry L., y J. Edward Berk. Gastroenterology. 3rd ed. Philadelphia [etc.]: Saunders, 1976.

Cita MLA (9a ed.)

Bockus, Henry L., y J. Edward Berk. Gastroenterology. 3rd ed. Saunders, 1976.