https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Ball%2C%20Samuel%2C%22&sort_by=title_az&format=rss 3 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=18175 Buenos Aires : Paidós, 1975 .
155 p.

]]> Place hold on Educación, vocación y ocupación /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=18175 ISBN:8427708246 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=40147 ]]> Madrid : Narcea, 1988 .
224 p. 8427708246

]]> Place hold on La motivación educativa :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=40147 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=49691 By Deutsch, Morton,.
Buenos Aires : Paidós, 1975 .
251 p.

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