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Literatuur
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Lambert MJ, Morton JJ, Hatfield DR, Harmon C, Hamilton S, Shimokawa K et.al. (2004) Administration and scoring manual for the OQ-45-2. Wilmington, DE: American Professional Credentialling Services LLC.
Lambert MJ (2007) Presidential address: What we have learned from a decade of research aimed at improving psychotherapy outcome in routine care. Psychotherapy Research 17,1-14.
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