1. Berne E. Sex In Human Loving. Simon and Schuster, New York, 1970, pp. 163–171.
2. Berne E. What Do You Say After You Say Hello? Grove Press, New York, 1972.
3. Steiner C. Games Alcoholics Play. Grove Press, New York, 1971.
4. Berne E. What Do You Say … op. cit., p. 344.