1. Belanger, D., & Feldman, S.M. (1962). Effects of water deprivation upon heart rate and instrumental activity in the rat. Journal of Comparative and Physiological Psychology, 55, 220–225.
2. Brener, J., Eissenberg, E., & Middaugh, S. (1974). Respiratory and somatal motor factors associated with operant conditioning of cardiovascular responses in curarized rats. In P.A. Obrist, A.H. Black, J. Brener, & L.V. DiCara (Eds.), Cardiovascular psychophysiology: Current issues in response mechanisms, biofeedback, and methodology. (pp. 251–275). Chicago: Aldine.
3. Elliott, R. (1969). Tonic heart rate: Experiments on the effects of collative variables lead to a hypothesis about its motivational significance. Journal of Personality and Social Psychology, 12, 211–228.
4. Elliott, R. (1974). The motivational significance of heart rate. In P.A. Obrist, A.H. Black, J. Brener, & L.V. DiCara (Eds.), Cardiovascular psychophysiology: Current issues in response mechanisms, biofeedback, and methodology. (pp. 505–537). Chicago: Aldine.
5. Fisher, A.E. (1982). The effects of differing levels of incentive on human heart. Unpublished master’s thesis, University of Iowa, Iowa City.