1. Ackerly, S.: Pre-Frontal Lobes and Social Development, Yale Journal of Biology: 22, 481, 1950.
2. Alexander, F. and French, T.: Fundamentals of Psychoanalysis, W. W. Norton and Co., New York, 1948.
3. Angier, R. P.: Conflict Theory of Emotion, Am. J. Psychol.: 39, 390, 1927.
4. Angell, J. R.: Conflict Theory of Emotion, Angell's Psychology, 4th Ed., 1910.
5. Bulbrook, M. E.: An Experimental Inquiry into the Existence and Nature of Insight, Am. J. Psychol.: 44, pp. 409–453, 1932.