1. Arraj, J. (1986). Jung's forgotten bridge. Journal of Analytical Psychology, 31, 173–180.
2. Jung, C. G. (1929). The significance of constitution and heredity in psychology. In The collected works of C. G. Jung. Vol. 8. Princeton: Princeton University Press. pp. 107–113.
3. Jung, C. G. (1936). Psychological typology. In The collected works of C. G. Jung. Vol. 6. Princeton: Princeton University Press. pp. 542–555.
4. Meier, C. A. (1971). Psychological types and individuation: A plea for more scientific approach in Jungian psychology. In J. B. Wheelwright (Ed.), The analytic process aims, analysis, training. New York: Puntam's. pp. 276–289.
5. Construction of Jung Psychological Types Scale