Cita APA (7th ed.)

Berry, L. H. (1974). Gastrointestinal pan-endoscopy: Esophagoscopy, gastroscopy, bulbar and postbulbar duodenoscopy, procto-sigmoidoscopy, colonoscopy, and peritoneoscopy. Thomas.

Cita Chicago (17th ed.)

Berry, Leonidas H. Gastrointestinal Pan-endoscopy: Esophagoscopy, Gastroscopy, Bulbar and Postbulbar Duodenoscopy, Procto-sigmoidoscopy, Colonoscopy, and Peritoneoscopy. Springfield, Ill.: Thomas, 1974.

Cita MLA (8th ed.)

Berry, Leonidas H. Gastrointestinal Pan-endoscopy: Esophagoscopy, Gastroscopy, Bulbar and Postbulbar Duodenoscopy, Procto-sigmoidoscopy, Colonoscopy, and Peritoneoscopy. Thomas, 1974.