https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Walker%2C%20Richard%2C%22&sort_by=title_az&format=rss 4 0 50 ISBN:9706906894 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=127132 ]]> By Walker, Richard,.
México : Planeta, 2002 .
96 p. : 9706906894

]]> Place hold on El cerebro :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=127132 ISBN:9706906347 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=126861 ]]> By Walker, Richard,.
México : Planeta, 2002 .
96 p. : 9706906347

]]> Place hold on El cuerpo :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=126861 ISBN:8430595503 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=160979 ]]> By Walker, Richard,.
Madrid : Susaeta, 2000 .
112 p. : 8430595503

]]> Place hold on Enciclopedia del cuerpo humano /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=160979 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=77526 By Marsh, Herbert W..
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331-345

]]> Place hold on Subject-specific components of academic self-concept and self-efficacy

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