APA (7th ed.) Citation
Sojo, E., Estapé, G., Zimmer, W., & de Simone, G. (1980). Endoscopic Study of Duodenal Tumors.
Chicago Style (17th ed.) Citation
Sojo, Enrique, Gonzalo Estapé, Walter Zimmer, and Gustavo de Simone. Endoscopic Study of Duodenal Tumors. 1980.
MLA (9th ed.) Citation
Sojo, Enrique, et al. Endoscopic Study of Duodenal Tumors. 1980.
Warning: These citations may not always be 100% accurate.