1. Abraham, K. Contributions to the Theory of the Anal Character. In K. Abraham, Selected Papers ( London, Hogarth Press, 1921.
2. Barnes, C.A. A Statistical Study of the Freudian Theory of Levels of Psychosexual Development. Genetic Psychology Monographs. 45 (1952) 109 – 174.
3. Beloff, H. The Structure and Origin of the Anal Character. Genetic Psychology Monographs 55 (1957) 141 – 172.
4. Bonaparte, M. Time and the Unconscious. International Journla of Psychoanalysis 21 (1940) 427 – 468.
5. Calabresi, R. and J. Cohen. Personality and Time Attitudes. Journal of Abnormal Psychology 78 (1968) 431 – 440.