Cita APA (7a ed.)

Sojo, E., Estapé, G., Zimmer, W., & de Simone, G. (1980). Endoscopic Study of Duodenal Tumors.

Cita Chicago Style (17a ed.)

Sojo, Enrique, Gonzalo Estapé, Walter Zimmer, y Gustavo de Simone. Endoscopic Study of Duodenal Tumors. 1980.

Cita MLA (9a ed.)

Sojo, Enrique, et al. Endoscopic Study of Duodenal Tumors. 1980.