00275nam a2200109 a 450000500170000008200160001710000210003324500390005426000250009330000230011863000240014120251202164310.0  a300.72bKER  aKerlinger,Fred,N  aFoundations of behavioral research  aNew DelhibCBSc1986  a667 p.c24 cm.bPB  aBehavioral research