https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22D%C3%BCrr%2C%20Otto%22&sort_by=title_az&format=rss 3 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=64519 By DURR, Otto.
Alemania .
70-88

]]> Place hold on El comportamiento pacífico

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=64519 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=101526 By Dürr, Otto.
Madrid : Rialp, 1971 .
165 p.

]]> Place hold on Educación en la libertar /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=101526 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=42228 By Dürr, Otto.
Barcelona, Esp. : Herder, 1969 .
157 p.

]]> Place hold on La obediencia en el niño /

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