Cita APA

Roman, F. J., Salgado-Ora, C., Katigbak, R. S., & Reyes, R. (1952). Diseases of the digestive system. [n.p].

Citación estilo Chicago

Roman, Francisco J., Carmen Salgado-Ora, Raymundo S. Katigbak, and Ricardo Reyes. Diseases of the Digestive System. Manila: [n.p], 1952.

Cita MLA

Roman, Francisco J., et al. Diseases of the Digestive System. [n.p], 1952.