https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22WEP.%22&sort_by=title_az&format=rss 2 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=153897 Paris : UNESCO, 1980 .
44 p.

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=153897 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=129634 París : | New York : | Rome : UNESCO ; | UNICEF ; | WFP, 1982 .
81 p.

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