https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Astudillo%20Urs%C3%BAa%2C%20Pedro%22&sort_by=title_az&format=rss 2 0 50 ISBN:9700718980 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=81336 ]]> By Astudillo Ursúa, Pedro.
México : Porrúa, 1999 .
238 p. 9700718980

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México : Porrúa, 2000 .
270 p. 9700726398

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