1. Babkin, B. P.Pavlov: A Biography. Chicago: University of Chicago Press, 1949.
2. Coon, D.Introduction to Psychology. St. Paul: West, 1977.
3. Coon, D. J. Eponymy, obscurity, Twitmyer, and Pavlov.Journal of the History of the Behavioral Sciences, 1982,18, 255–262.
4. Dallenbach, K. M. Twitmyer and the conditioned response.American Journal of Psychology, 1959,72, 633–638.
5. Gureeva, N. M., and Chebysheva, N. A. Letopis’ Zhizni i Deiatelnosti Akademika I. P. Pavlova (Annals of the Life and Work of the Academician I. P. Pavlov). Leningrad: Izdatel’stvo “Nauka,” 1969.