WHO. (1990). Management of cataract in primary health care services. World Health Organisation.
استشهاد بنمط شيكاغوWHO. Management of Cataract in Primary Health Care Services. Geneva: World Health Organisation, 1990.
MLA استشهادWHO. Management of Cataract in Primary Health Care Services. World Health Organisation, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.