https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Williams%2C%20Gareth.%22&sort_by=title_az&format=rss 4 0 50 ISBN:970103838X https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=97298 ]]> By Williams, Gareth.
México : McGraw-Hill, 2002 .
646 p. 970103838X

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=97298 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=98115 By Williams, Gareth..

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=98115 ISBN:9231014498 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=161867 ]]> By Williams, Gareth..
Paris : UNESCO, 1977 .
188 p. 9231014498

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Paris : UNESCO, 1978 .
211 p. 9232014491

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