Bickman, Leonard. (1992). Designing outcome evaluations for children's mental health services: Improving internal validity
.
1992(54), 57-68. 10.1002/ev.1608
Bickman, Leonard. (1992). Designing outcome evaluations for children's mental health services: Improving internal validity
. 1992(54), 57-68. 10.1002/ev.1608