Cita APA (7a ed.)

Piñeyro, A., Perrier, J., & Bergalli, L. (1978). Umbilical hernia strangulated to liver contents.

Cita Chicago Style (17a ed.)

Piñeyro, Alberto, José Perrier, y Luis Bergalli. Umbilical Hernia Strangulated to Liver Contents. 1978.

Cita MLA (9a ed.)

Piñeyro, Alberto, et al. Umbilical Hernia Strangulated to Liver Contents. 1978.