00505nam a22001692  4500001001100000005001700011008004100028020001700069040001500086050001700101100003000118245007100148260003300219300001100252650003800263700003400301000000354320151217145735.0070509s        xx            000 0 eng d  a0856649171 :  aKABUcKABU 0aLB1028b.C641 aCohen, Louis.@000015353410aResearch methods in education /cLouise Cohen and Lawrence Manion.  aLondon :bCroom Helm,c1980.  a328 p. 0aEducational Research.@00001535351 aManion, Lawrence.@0000153536