Cita APA (7th ed.)

Cunningham, F. G., MacDonald, P. C., & Gant, N. F. (1996). Obstetricia de Williams (20 ed.). Masson.

Cita Chicago (17th ed.)

Cunningham, F. Gary, Paul C. MacDonald, i Norman F. Gant. Obstetricia De Williams. 20 ed. Buenos Aires: Masson, 1996.

Cita MLA (9th ed.)

Cunningham, F. Gary, et al. Obstetricia De Williams. 20 ed. Masson, 1996.