Cita APA (7a ed.)

Antiga, E., Chavarria, O., & Grezzi, R. (1971). Gallbladder volvulus.

Cita Chicago Style (17a ed.)

Antiga, E., O. Chavarria, y R. Grezzi. Gallbladder Volvulus. 1971.

Cita MLA (9a ed.)

Antiga, E., et al. Gallbladder Volvulus. 1971.