https://biblioteca.uaysen.cl/cgi-bin/koha/opac-search.pl?q=ccl=au%3ACortella%2C%20Mario%20Sergio%2C&format=rss2 9 0 50 ISBN 9788427723665 (e-book) https://biblioteca.uaysen.cl/cgi-bin/koha/opac-detail.pl?biblionumber=195256 By Cortella, Mario Sergio.. . 1 recurso en línea (160 páginas) 9788427723665 (e-book)

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