https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=%28su%3A%22CONTRATOS%20COMERCIALES%22%29&sort_by=title_az&format=rss 3 0 50 ISBN:9706135642 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=126039 ]]> By Díaz Bravo, Arturo.
México : Oxford University, 2002 .
357 p. 9706135642

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=126039 ISBN:8477385017 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=109227 ]]> By Clemente Ramos, Ana María.
Madrid : Síntesis, 1997 .
170 p. : 8477385017

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=109227 ISBN:8477386846 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=96814 ]]> By Arcarons Simón, Ramón.
Madrid : Síntesis, 1999 .
191 p. : 8477386846

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