1. Abraham, K. (1924). A short study of the development of the libido, viewed in the light of mental disorders. In Selected Papers of Karl Abraham. London: Hogarth Press, 1927, pp. 418—501.
2. Resistance Analysis and Psychic Reality
3. Becht, M.C., Poortinga, Y.H. & Vingerhoets, A. (2001). Crying across countries . In Adult Crying: A Biopsychosocial Approach, ed. A. Vingerhoets & R.R. Cornelius. East Sussex: Brunner-Routledge , pp. 135—158.