1856-1939 1902-1987 1904- 1996c-749 2001j-913 behavior behaviorism behaviorism(psychology) bf199n994l1992 bf199o265p2001 burrhusfrederic carlr chenal conditioning freud humanisticpsychology jeanpaul lemieux operant pierre psychoanalysis psychology rogers sigmund skinner wz112n994t1996