OMS. Vitamin A deficency and its consequences. Geneva: OMS.
Trích dẫn kiểu ChicagoOMS. Vitamin A Deficency and Its Consequences. Geneva: OMS.
ציטוט MLAOMS. Vitamin A Deficency and Its Consequences. Geneva: OMS.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.