1. Der Nagel;Pinkus,1927
2. On the structure and formation of the nails of the fingers and toes;Rainey;Trans Microscop Soc London,1849
3. Entwichtlungsgeschichte und anatomy;Unna,1883
4. The nail in health and disease;Zaias,1990
5. Microscopic studies of fetal and mature nail and surrounding soft tissue;Lewis;AMA Arch Dermatol Syph,1954