Universidad de Aconcagua – Sistema de Bibliotecas:
<br/>
<br/>Manual of obstetrics :  diagnosis and therapy / 
Edited by Kenneth R. Niswander  and Arthur T. Evans 
 - 4th ed. 
 - Boston :  Little, Brown and Company,  1991. 
 - xiii, 541 p. :  il. 
 - (Little, Brown Spiral Manual Series) .
 - (Little, Brown Spiral Manual Series) .