Cita APA (7a ed.)

Balboa, O., Voelker, R., & Delgado, F. (1980). Manometry in esophageal achalasia.

Cita Chicago Style (17a ed.)

Balboa, Oscar, Ricardo Voelker, y Fernando Delgado. Manometry in Esophageal Achalasia. 1980.

Cita MLA (9a ed.)

Balboa, Oscar, et al. Manometry in Esophageal Achalasia. 1980.