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Richards DA, Suckling R (February 2009). “Improving access to psychological therapies: Phase IV prospective cohort study”. Br J Clin Psychol48 (Pt 4): 377–96. doi:10.1348/014466509X405178. PMID19208291.
Taylor CB, Chang VY (2008). “Issues in the dissemination of cognitive-behavior therapy”. Nord J Psychiatry62 Suppl 47: 37–44. doi:10.1080/08039480802315673. PMID18752117.