World Health Organization. (1997). Strategies for the prevention of blindness in national programmes: A primary health care approach (Second edition.). World Health Organization.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)World Health Organization. Strategies for the Prevention of Blindness in National Programmes: A Primary Health Care Approach. Second edition. Geneva: World Health Organization, 1997.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)World Health Organization. Strategies for the Prevention of Blindness in National Programmes: A Primary Health Care Approach. Second edition. World Health Organization, 1997.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.