00452nam a2200097Ia 4500008004100000050002200041100001500063245009000078247011000168264007600278230508s1992    xx            000 0 und d  aLB 1028 G285 19921 aGay, L. R.10aEducational research: bcompetencies for analysis and application 4th ed.cGay, L. R.  aEducational research: competencies for analysis and application 4th ed._LB 1028 G285 1992_Gay, L. R._1992  a[Place of publication not identified] : bMacmillan Publishers, c1992.