A Note on the Paper * by Richard A. Littman and Edward A. Wade Entitled “A Negative Test of the Drive-Reduction Hypothesis”

Coppock H. W. (1950). An investigation of secondary reinforcing effect of a visual stimulus as a function of its temporal relation to shock termination Indiana University Unpublished doctoral dissertation, 1950.

Coppock H. W. (1951). Secondary reinforcing effect of a stimulus repeatedly presented after electric shock. Amer. Psychol. 6, 277.

Littman R. A. Wade E. A. (1955). A negative test of the drive reduction hypothesis. Quart. J. exp. Psychol. 7, 56–66.