Cita APA (7a ed.)

Purtilo, D. T., & Purtilo, R. B. (1989). A survey of human diseases (2nd ed.). Little Brown.

Cita Chicago Style (17a ed.)

Purtilo, David T., y Ruth B. Purtilo. A Survey of Human Diseases. 2nd ed. Boston: Little Brown, 1989.

Cita MLA (9a ed.)

Purtilo, David T., y Ruth B. Purtilo. A Survey of Human Diseases. 2nd ed. Little Brown, 1989.