000			00590nam a2200193Ia 4500
999			_c19216 _d19216
082			_a300.72 HEL-;
100			_aHelmstadter, G.C.
245		0	_aResearch concepts in human behaviour: education, psychology, sociology
260			_aNew York _bAppleton-Century-Crofts _c1970
300			_a448p.
440			_aCentury Psychology Series
650			_aSocial sciences - Research
650			_aEducation - Research
650			_aResearch - Statistical methods
650			_aPsychology - Research
650			_aResearch - Methodology
650			_aHuman behavior - Research
942			_cBK