1. “Theories of Motivation,”;Bolles,1975
2. Prediction of feeding behavior from energy flows in the rat;Booth,1978
3. “The Wisdom of the Body.”;Cannon,1932
4. Optimal foraging: The marginal value theorem;Charnov;Theor. Pop. Biol.,1976
5. Thirst as a determinant of reinforcement;Collier,1964