Country and area. (1980). Sixth Report On The Word. Geneva: World Health Organization.
استشهاد بنمط شيكاغوCountry and area. Sixth Report On The Word. Geneva: World Health Organization, 1980.
MLA استشهادCountry and area. Sixth Report On The Word. Geneva: World Health Organization, 1980.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.