Παραπομπή APA

WHO. (1990). Management of cataract in primary health care services. World Health Organisation.

Παραπομπή Chicago Style

WHO. Management of Cataract in Primary Health Care Services. Geneva: World Health Organisation, 1990.

Παραπομπή MLA

WHO. Management of Cataract in Primary Health Care Services. World Health Organisation, 1990.