Harrington D. M., Block J. H., Block J. (1987). Testing aspects of Carl Rogers' theory of creative environments: Child-rearing antecedents of creative potential in young adolescents. Journal of Personality and Social Psychology, 52, 851-856.
Lietaer G. (1984). Unconditional positive regard: A controversial basic attitude in client-centered therapy. In R. F. Levant, J. M. Schlien (Eds.). Client-centered therapy and the person-centered approach: New directions in theory, research and practice. New York: Prager.
Ogilvie D. M. (1987). The undesired self: A neglected variable in personality research. Journal of Personality and Social Psychology, 52, 379-385.
Wexler D., Rice L. (1974). Innovations in client-centered therapy. New York: Wiley.