1. 1. J Jadassohn, and F. Lewandowsky, Pachyonychia congenita . In: Nesser A, Jacoby E, eds. Ikonographia dermatological. Berlin: Urban & Schwarzenberg, 1906:29-31.
2. Pachyonychia Congenita: A Clinical Study of 12 Cases and Review of the Literature
3. A family with pachyonychia congenita affecting the nails only
4. Pachyonychia congenita in the absence of other syndrome abnormalities
5. 5. WAD Griffith, MR Judge, and IM. Leigh, Disorders of keratinization . In: Burns DA, Breathnach SM, Champion RH, Burton JL, eds. Textbook of dermatology, 6th ed. Oxford: Blackwell Science, 1998:1564-1565.