1. Akiskal, H. S., and McKinney, W. T. 1973. Depressive Disorders: Toward A Unified Hypothesis. Science 182:20–29.
2. Akiskal, H. S., and McKinney, W. T. 1975. Overview of Recent Research in Depression. Arch. Gen. Psychiat. 32:285–305.
3. Alexander, B. K. 1966. The Effects of Early Peer-Deprivation on Juvenile Behavior of Rhesus Monkeys. Unpublished doctoral dissertation, University of Wisconsin.
4. Allen, J. R., Schiltz, K. A., Ripp, C., Eisele, S. C., and Johnson, L. C. 1967. Laboratory Procedures. Regional Primate Research Center and Laboratory, Madison: University of Wisconsin.
5. Arling, G. L., Ruppenthal, G. C., and Mitchell, G. D. 1969. Aggressive Behavior of the Eight Year Old Nulliparous Isolate Female Monkey. Anim. Behav. 17:109–113.