https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Johnson%2C%20Roy%22&sort_by=title_az&format=rss 3 0 50 ISBN:9700517624 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=119777 ]]> By Johnson, Roy.
México : Grijalbo, 2002 .
72 p. : 9700517624

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=119777 ISBN:847774064X https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=104147 ]]> By Johnson, Marjorie Seddon.
Madrid : Visor : | Ministerio de Educación y Ciencia, 1990 .
187 p. 847774064X

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=104147 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=58995 By Johnson, Roy Ivan.
Boston [E.U.A.] : Ginn, 1940 .
xv, 413 p., [60] p. de láms.

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