References
- Habif TP. Benign skin tumors. In: Clinical dermatology: a color guide to diagnosis and therapy. 4th ed. New York: Mosby, 2004: 698–723
- Bolognia JL, Braverman IM. Skin manifestations of internal disease. In: Kasper DL, Braunwald E, Fauci A, et al, eds. Harrison's principles of internal medicine. 16th ed. New York: McGraw-Hill, 2005: 296–311.