Evaluated the psychotherapeutic adjunct of bibliotherapy in a maximum security correctional setting with 54 male inmate volunteers (mean age 34.5 yrs) from a general and segregation population. Ss were provided with a personal growth packet, a rational growth packet, or a general readings packet for 4 wks of treatment. Ss completed the Levenson Tridimensional Locus of Control Scale and the Personal Attribute Inventory immediately after treatment and at 6-wk follow-up. Results indicate no differences between the treatment methods, but significant increases in self-concept and internal locus of control with an interaction on the dependent measure of Chance locus of control. There were no significant effects on the dependent variables as a result of the level of participation of the volunteers. It is concluded that bibliotherapy may have a facilitative effect on self-concept and internal locus of control, but cannot be differentiated from the effects of therapist intervention. (16 ref) (PsycINFO Database Record (c) 2016 APA, all rights reserved)