References
- Stein , C. 1959 . A challenging group of three . Group Psychoth. , 12 : 236 – 239 .
- Stein , C. 1960 . And now there are four . Group Psychoth. , 13 : 14 – 21 .
- Stein , C. 1961 . Psychodrama for nurses in the sick room . Group Psychoth. , 14 ( 1–2 )