00374nam a2200145   450000100060000000300030000600500170000900800410002603500190006703500180008605000200010410000220012424500560014626000260020213074UR20220427201338.0061102|||||||||||||||||||||||||||||||| d  a(janium) 13063  a(janium)13063 4aBF319b.B5 19611 aBirney, Robert C.10aReinforcementb : an enduring problem in psychology  bD. Van Nostrandc1961