1. Berkow R. The Merck Manual of Diagnosis and Therapy. 4th ed. New Jersey: Merck Sharp & Dome, 1992: 2425–2426.
2. Fauci AS, Braunwald E. Isselbacher KJ, Wilson JD, Martin JB, Kasper DL, Hauser SL, Longo DL. Harrison's Principles of Internal Medicine. 14th ed. New York: McGraw Hill, 1998: 2549–2550.
3. Pediculosis Ciliaris