https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Merttens%2C%20Ruth%22&sort_by=title_az&format=rss 2 0 50 ISBN:1403467358 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=171974 ]]> By Merttens, Ruth.
Chicago, E.U.A. : Heinemann Library, 2005 .
24 p. : 1403467358

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=171974 ISBN:1403467382 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=171972 ]]> By Merttens, Ruth.
Chicago, E.U.A. : Heinemann Library, 2005 .
24 p. : 1403467382

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