1. Zaias N. Psoriasis of the nail. A clinical-pathologic study. Archives of Dermatology. 1969;99(5):567-579
2. Salomon J, Szepietowski JC, Proniewicz A. Psoriatic nails: A prospective clinical study. Journal of Cutaneous Medicine and Surgery. 2003 Jul-Aug;7(4):317-321
3. Kerkhof PCM, Schalkwijk J. Psoriasis. In: Callen JP, Horn TD, Mancini AJ, Salasche SJ, Schaffer JV, Schwarz T, et al., editors. Dermatology. 2nd ed. New York: Mosby Elsevier; 2008. pp. 115-135
4. Lomholt G. Environment and genetics in psoriasis. Annals of Clinical Research. 1976 Oct;8(5):290-297
5. McGonagle D, Tan AL, Benjamin M. The nail as a musculoskeletal appendage-implications for an improved understanding of the link between psoriasis and arthritis. Dermatology. 2009;218:97-102