Cita APA (7a ed.)

Sojo, E., & Estapé, G. (1977). Biological sequence of malign gastric ulcer.

Cita Chicago Style (17a ed.)

Sojo, Enrique, y Gonzalo Estapé. Biological Sequence of Malign Gastric Ulcer. 1977.

Cita MLA (9a ed.)

Sojo, Enrique, y Gonzalo Estapé. Biological Sequence of Malign Gastric Ulcer. 1977.