https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Ward%2C%20Barbara%2C%22&sort_by=title_az&format=rss 2 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=40061 By Ward, Barbara,.
México : FCE, 1976 .
502 p. :

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=40061 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=54650 By Ward, Barbara,.
México : FCE, 1972 .
278 p. , "Informe no oficial de las Naciones Unidas sobre el medio ambiente humano"

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