Cita APA (7a ed.)

Cunningham, F. G. (2011). Williams Obstetricia (23.ed.). Mc Graw Hill.

Cita Chicago Style (17a ed.)

Cunningham, F. Gary. Williams Obstetricia. 23.ed. Mexico: Mc Graw Hill, 2011.

Cita MLA (9a ed.)

Cunningham, F. Gary. Williams Obstetricia. 23.ed. Mc Graw Hill, 2011.