1. Barrett-Lennard, G. T. (1998). Carl Rogers’ helping system: journey and substance. London: Sage.
2. Kramer, R. (1995). The birth of client-centred therapy: Carl Rogers, Otto Rank, and ‘the beyond’. Journal of Humanistic Psychology, 35 (4), 54–110.
3. Rogers, C. R. (1980). A way of being. Boston, MA: Houghton Mifflin.
4. Rogers, C. R., and Russell, D. E. (2002). Carl Rogers: the quiet revolutionary–an oral history. Roseville, CA: Penmar in Books.
5. Thorne, B. (2003). Carl Rogers (2nd edn). London: Sage.