APA
Clark D. A., . (2005). Intrusive thoughts in clinical disorders. New York: Guilford Press.
Chicago
Clark David A, . 2005. Intrusive thoughts in clinical disorders. New York: Guilford Press.
Harvard
Clark D. A., . (2005). Intrusive thoughts in clinical disorders. New York: Guilford Press.
MLA
Clark David A, . Intrusive thoughts in clinical disorders. New York: Guilford Press. 2005.