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2. Bringhurst, D.L., Watson, C.W., Miller, S.D. & Duncan, B.L. (2006). The reliability and validity of the Outcome Rating Scale: a replication study of a brief clinical measure. Journal of Brief Therapy, 5, 23-30.
3. Duncan, B.L. (2006). Persoonlijke mededeling (e-mail 20 augustus).
4. Duncan, B.L. (2010). On becoming a better therapist. Washington: American Psychological Association.
5. Duncan, B.L., Miller, S.D., Sparks, J.A. (2004). The heroic client: a revolutionary way to improve effectiveness through client-directed outcome informed therapy. San Francisco: Jossey-Bass.