APA (7th ed.) Citation

HW, P., I, C., JM, d. R., & B, Z. (1991). Resection for achalasia of the esophagus. Hepato-gastroenterology, 38(6), 470.

Chicago Style (17th ed.) Citation

HW, Pinotti, Cecconello I, da Rocha JM, and Zilberstein B. "Resection for Achalasia of the Esophagus." Hepato-gastroenterology 38, no. 6 (1991): 470.

MLA (9th ed.) Citation

HW, Pinotti, et al. "Resection for Achalasia of the Esophagus." Hepato-gastroenterology, vol. 38, no. 6, 1991, p. 470.