000			00290nam a2200109Ia 4500
008			220117s9999||||xx |||||||||||||| ||und||
040			_cIAB
082			_a370.7'8 COH.
100			_aCohen,Louis.& Manion,Lawrence
245		0	_aResearch Methods In Education.3Rd.Ed.
260			_bRoutledge. _c1989
999			_c29030 _d29030