G. Hajcak, Huppert, J.D. , and Foa, E.B. . 2006. “Obsessive-Compulsive Disorder”. In Practitioners Guide To Evidence Based Psychotherapy, Pp. 453-460. New York: Springer. http://pluto.huji.ac.il/ huppertj/Obsessive_Compulsive_Disorder.pdf.