Drucker P. F. (1939). The end of economic man. New York: Day.

Eastman M. (1928). The enjoyment of poetry. New York: Scribner’s.

Einstein A., & Infeld L. (1938). The evolution of physics. New York: Simon & Schuster.

Erikson E. (1959). Identity and the life cycle. New York: International Universities Press.

Farrow E. P. (1942). Psychoanalyze yourself. New York: International Universities Press.

Frankl V. (1969). The will to meaning. New York: World.

Frenkel-Brunswik E. (1949). Intolerance of ambiguity as an emotional and perceptual personality variable. Journal of Personality, 18, 108–143.

Freud S. (1920). General introduction to psychoanalysis. New York: Boni & Liveright.

Freud S. (1924). Collected papers, Vol. II. London: Hogarth Press.

Freud S. (1930). Civilization and its discontents. New York: Cape & Smith.

Freud S. (1933). New introductory lectures on psychoanalysis. New York: Norton.

Fromm E. (1941). Escape from freedom. New York: Farrar, Straus & Giroux.

Fromm E. (1947). Man for himself. New York: Holt, Rinehart & Winston.

Goldstein K. (1939). The organism. New York: American Book.

Goldstein K. (1940). Human nature. Cambridge: Harvard University Press.

Grof S. (1975). Realms of the human unconscious. New York: Viking Press.

Guiterman A. (1939). Lyric laughter. New York: Dutton.

Harding M. E. (1947). Psychic energy. New York: Pantheon.

Harlow H. F. (1950). Learning motivated by a manipulation drive. Journal of Experimental Psychology, 40, 228–234.

Harlow H. F. (1953). Motivation as a factor in the acquisition of new responses. In R. M. Jones (Ed.), Current theory and research in motivation. Lincoln: University of Nebraska Press.