1. Abraham, K. (1949). Ejaculatio praecox. In Jones, E. (ed.),Selected Papers on Psychoanalysis Hogarth, London.
2. Allen, C. A. (1962).Textbook of Psychosexual Disorders Oxford Univ. Press, London.
3. Brim, C. J. (1936).Medicine in the Bible Froben Press, New York.
4. Cattell, R. B. (1957).Handbook for the I.P.A.T. Anxiety Scale Institute for Personality and Ability Testing, Champaign, Illinois.
5. Cooper, A. J. (1967). Disorders of sexual potency in the male: A study of some factors of relevance to short-term prognosis. Unpublished doctoral thesis, University of Bristol, Bristol.