00331nam a2200121Ia 4500008004100000040001500041041001200056082001700068100001900085245005100104260003700155300001700192230917s9999||||xx |||||||||||||| ||und||  e6570aMAIN  aEnglish  a155.22 W668P  aWillerman, Lee 0aPsychology of individual and group differences  aSan FranciscobW H Freemanc1979  aviii, 531 p.