003700000a22001210004500060000800000082001200008100001800020245006400038260004400102260000900146300000800155650008500163  a100  a156 HUL  aHull, Clark L  aPrinciples of behavior : an introduction to behavior theory  aNew York, Appleton - century crofts Inc  c1943  a415  aAnimal  behavior/ animal behavior  - biological aspects/ stimulus generalization