Yorston, D. (1999). The Global Initiative Vison 2020: The Right to Sight Childhood Blindness. International Centre for Eye Health.
শিকাগো স্টাইলে সাইটেশনYorston, David. The Global Initiative Vison 2020: The Right to Sight Childhood Blindness. International Centre for Eye Health, 1999.
এমএলএ সাইটেশনYorston, David. The Global Initiative Vison 2020: The Right to Sight Childhood Blindness. International Centre for Eye Health, 1999.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.