1. Einstein, A., and Freud, S. (1989). Why War?, Shalom Press International. [6th ed.].
2. Freud, S., and Strachey, J. (1989). Beyond the Pleasure Principle, Norton.
3. War Is Not Inevitable-Why War Revisited;Parens;Psychol. Behav. Sci. Int. J.,2017
4. Freud, S., Strachey, J., and Alexander, F. (1965). Group Psychology and the Analysis of the Ego, Bantam Books. [6th ed.].
5. Le Bon, G. (1977). The Crowd: A Study of the Popular Mind, Penguin Books.