1. BERNE, Eric: Games People Play, p. 38 Grove Press, New York, 1964.
2. Berne Eric: Games People Play, p. 178, 180. Grove Press, New York, 1964.
3. BERNE, Eric: Transactional Analysis in Psychotherapy, Grove Press, New York, 1961.
4. Ernst F. H.Jr.: Handbook of Listening, p. 106, 1971.
5. Ernst F. H.Jr.: Handbook of Listening, p. 141, 1971.