This document lists several bibliographic resources for research. It includes the URLs for SpringerLink, a multidisciplinary digital library; BVS, an online catalog of biomedical and health literature; ProQuest, a database for journals, dissertations and publications; ebrary, an online collection of full-text books and documents; and Gale, a database for academic journals, books, and documents.

4.  Bibliografía
 http://www.springerlink.com/journals/?M
UD=MP
 http://www.bvs.org.ec/php/index.php
 http://search.proquest.com/index
 http://site.ebrary.com/lib/utasp/home.a
ction
 http://find.galegroup.com/menu/comm
onmenu.do?userGroupName=uta_cons