1. Scher RK. The nail. In: Roenigk RK, Roenigk HH, editors. Dermatologic surgery principles and practice. 2nd ed. New York, NY: Marcel Dekker Inc; 1996. p. 389–400.
2. Krull EA. Longitudinal melanonychia. In: Krull EA, Zook EG, Baran R, et al., editors. Nail unit: a text and atlas. Philadelphia: Lippincott Williams & Wilkins; 2001. p. 239–74.
3. MacFarlane DF, Scher RK. Nail surgery. In: Ratz JL, editor. Textbook of dermatologic surgery. Philadelphia: Lippincott-Raven Publishers; 1998. p. 621–9.
4. MacFarlane DF, Scher RK. Nail surgery. In: Nouri K, editor. Techniques in dermatologic surgery: St. Louis Mosby Elsevier Ltd; 2003. p. 195–201.
5. Jellinek NJ. Nail unit: practical tips and treatment options. Dermatol Therapy. 2007;20:68–74.