(1997). Vitamin A Supplements: A Guide to their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia (2nd.). World Health Organisation.
শিকাগো স্টাইলে সাইটেশনVitamin A Supplements: A Guide to Their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia. 2nd. Geneva: World Health Organisation, 1997.
এমএলএ সাইটেশনVitamin A Supplements: A Guide to Their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia. 2nd. World Health Organisation, 1997.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.