https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3ACentro%20de%20Ecodesarrollo%2C&sort_by=title_az&format=rss 3 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=12896 México : Centro de Ecodesarrollo, 1982 .
146 p. :

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=12896 ISBN:9684293178 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=24590 ]]> By Barkin, David.
México : | Nueva Imagen, Centro de Ecodesarrollo : 1982 .
205 p. 9684293178

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