TY - RPRT TI - Practice as a psychotherapeutic variable: an experimental analysis within single cases. AU - H Leitenberg AU - S Agras AU - J A Edwards AU - L E Thomson AU - J P Wincze PY - 1970 DO - 10.1016/0022-3956(70)90009-9 UR - https://pubmed.ncbi.nlm.nih.gov/5440862/ ID - 5440862 ER -