1. 1. O. S. Ormsby, and H. Montgomery : Diseases of the Skin , Ed. 8 . Philadelphia: Lea & Febiger, 1955 ; p. 226 .
2. Adverse Effects of Sunlight on the Skin
3. Sunlight and the skin
4. 5. P. G. Unna, and J. Orth : Lehrbuch der Speciellen Pathologischen Anatomie . Berlin: A. Hirschwald, 1887 ; p. 719 .