APA (7th ed.) Citation

(1972). Chronic duodenal ulcer. Appleton-Century-Crofts [u.a.].

Chicago Style (17th ed.) Citation

Chronic Duodenal Ulcer. New York: Appleton-Century-Crofts [u.a.], 1972.

MLA (9th ed.) Citation

Chronic Duodenal Ulcer. Appleton-Century-Crofts [u.a.], 1972.