1. Easton SC. Rudolf Steiner: herald of a new epoch. SteinerBooks, Later printing editor. 1980. p 376.
2. Wellbeloved S. Gurdjieff: the key concepts. Routledge Key Guides. Press P, Routledge, editor. 2003.
3. Reich W, Mary Boyd Higgins DJ. Beyond psychology: letters and journals 1934–1939. Farrar S and G, editor.
4. Reich W. Character analysis. 3rd ed: Farrar, Straus and Giroux, New York, USA; 1980.
5. Janov A. The new primal scream: primal therapy twenty years on. Abacus, editor.