Cita APA (7th ed.)

Callen, J. P. (2003). Dermatological signs of internal disease (3rd ed.). Saunders.

Cita Chicago (17th ed.)

Callen, Jeffrey P. Dermatological Signs of Internal Disease. 3rd ed. London: Saunders, 2003.

Cita MLA (9th ed.)

Callen, Jeffrey P. Dermatological Signs of Internal Disease. 3rd ed. Saunders, 2003.