APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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