1. Barnett, S. A. The rat: A study in behavior. Chicago: Aldine, 1963.
2. Beach, F. A. The snark was a boojum. Amer. Psychol., 1950, 5, 115–124.
3. Bitterman, M. E. Toward a comparative psychology of learning. Amer. Psychol., 1960, 15, 704–712.
4. Boice, R. The problem of domestication in the laboratory rat and a comparison of partially reinforced “discriminatory” and anticipatory licking in domestic and wild strains of Rattus norvegicus. Unpublished doctoral dissertation, Michigan State University, 1966.
5. Hinde, R. A. Animal behavior. New York: McGraw-Hill, 1966.