Carroll, K. M., Nich, C., Sifry, R. L., Nuro, K. F., Frankforter, T. L., Ball, S. A., … Rounsaville, B. J. (2000). A general system for evaluating therapist adherence and competence in psychotherapy research in the addictions. Drug and Alcohol Dependence, 57(3), 225–238. https://doi.org/10.1016/S0376-8716(99)00049-6