MLA

Hertl, and Michael Hertl. Autoimmune Diseases of the Skin. Springer Vienna, 2005.

APA

Hertl, H., & Hertl, M. (2005). Autoimmune Diseases of the Skin. Springer Vienna.

Chicago

Hertl, and Michael Hertl. Autoimmune Diseases of the Skin. : Springer Vienna, 2005.