1. Berne Eric Principles of Group Treatment. Oxford University Press, New York, 1964, p. 220.
2. Berne Eric Principles of Group Treatment. Oxford University Press, New York, 1964, p. 216.
3. Berne Eric Principles of Group Treatment. Oxford University Press, New York, 1964, p. 312.
4. Berne, op. cit., p. 105. Cf. Berne Eric. Transactional Analysis in Psychotherapy. Grove Press, New York, 1961, pp. 233–234.