http://www.sciencedirect.com/ http://isiknowledge.com/ http://www.myendnoteweb.com/ http://ovidsp.tx.ovid.com/spa/ovidweb.cgi?&S=ELFPFPFJLBDDLOBMMCGLDDOKNMAFAA00&clpg=dblist&Change+Language=es http://search.ebscohost.com/ http://www.unicolmayor.edu.co/invest_nova/NOVA/INICIO.htm talarcon@univalle.edu.co mediateca@univalle.edu.co
