Cita APA (7a ed.)

Perrone, L., Estrugo, R., Bounous, m., Paperán, J. A., Bercianos, C., & Lerena, A. (1977). The papillosphincterotomy in hydatid liver cysts opening into the biliary tract.

Cita Chicago Style (17a ed.)

Perrone, Luis, Roberto Estrugo, ma Bounous, Juan A. Paperán, Carlos Bercianos, y Alberto Lerena. The Papillosphincterotomy in Hydatid Liver Cysts Opening into the Biliary Tract. 1977.

Cita MLA (9a ed.)

Perrone, Luis, et al. The Papillosphincterotomy in Hydatid Liver Cysts Opening into the Biliary Tract. 1977.