1. Motivation of Behavior 1961
2. Cofer, C. N., Motivation: Theory and Research: 543 (1964).
3. Kimble, G. A., Hilgard and Marquis' Conditioning and Learning: 263 (1961).
4. Relative Reinforcement Values of Food and Intracranial Stimulation
5. Kling J. W. paper presented at the American Psychological Association meeting September (1964).