Sommer, A. (1995). Vitamin A deficiency and its consequences: A field guide to detection and control (3rd ed.). World Health Organization.
Chicago-Zitierstil (17. Ausg.)Sommer, Alfred. Vitamin A Deficiency and Its Consequences: A Field Guide to Detection and Control. 3rd ed. Geneva: World Health Organization, 1995.
MLA-Zitierstil (8. Ausg.)Sommer, Alfred. Vitamin A Deficiency and Its Consequences: A Field Guide to Detection and Control. 3rd ed. World Health Organization, 1995.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.