Cita APA (7th ed.)

Cunningham, F. G. (2006). Obstetricia de Williams (22 ed.). McGraw - Hill.

Cita Chicago (17th ed.)

Cunningham, F. Gary. Obstetricia De Williams. 22 ed. México, D.F: McGraw - Hill, 2006.

Cita MLA (9th ed.)

Cunningham, F. Gary. Obstetricia De Williams. 22 ed. McGraw - Hill, 2006.