Cita APA (7th ed.)

Sommer, A. (1995). Vitamin A deficiency and its consequences: A field guide to detection and control (3rd ed.). World Health Organization.

Cita Chicago (17th ed.)

Sommer, Alfred. Vitamin A Deficiency and Its Consequences: A Field Guide to Detection and Control. 3rd ed. Geneva: World Health Organization, 1995.

Cita MLA (8th ed.)

Sommer, Alfred. Vitamin A Deficiency and Its Consequences: A Field Guide to Detection and Control. 3rd ed. World Health Organization, 1995.