Gerken, PhD, CTRS, CPRP, CDSS, M. D., P. Costello, PhD, and L. Mrkic, MS. “The Prevalence of Evidence-Based Practice by the Certified Therapeutic Recreation Specialist in the Intervention Planning Process for Client Treatment”. American Journal of Recreation Therapy, vol. 12, no. 1, Jan. 2013, pp. 23-30, doi:10.5055/ajrt.2013.0037.