Moore DP, Jefferson JW. Specific phobia. In: Moore DP, Jefferson JW, eds. Handbook of Medical Psychiatry. 2nd ed. Philadelphia, Pa: Mosby Elsevier;2004:chap 85.
Katon W, Geyman JP. Anxiety disorders. In: Rakel RE, ed. Textbook of Family Medicine. 7th ed. Philadelphia, Pa:Saunders Elsevier;2007:chap 57.