https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Le%C3%B3n%2C%20Carlos%22&sort_by=title_az&format=rss 3 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=11822 By León, Carlos.
México : [s.n.], 1935 .
40 p.

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=11822 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=207793 By Benavides León, Carlos Andrés | López Rodríguez, Nelly Milady.

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