00330nam a2200109Ia 4500008004100000040003800041100001800079245003700097260003800134300001300172653003500185211228s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aRoss, James S 0aGroundwork of educational theory  bGeorge G.Harrap Co.aLondonc1949  a264p. p.  aEducation-psychological aspect