OMS. Requirements of vitamin A, iron folate and vitamin B12. Geneva: OMS.
Trích dẫn kiểu ChicagoOMS. Requirements of Vitamin A, Iron Folate and Vitamin B12. Geneva: OMS.
MLA引文OMS. Requirements of Vitamin A, Iron Folate and Vitamin B12. Geneva: OMS.
警告：這些引文格式不一定是100％准確.