World Health Organization. (1991). The Work of WHO in the Eastern Mediterranean Region: Annual Report of the Regional Director. World Health Organization Regional Office for the Eastern Mediterranean.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)World Health Organization. The Work of WHO in the Eastern Mediterranean Region: Annual Report of the Regional Director. Egypt: World Health Organization Regional Office for the Eastern Mediterranean, 1991.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)World Health Organization. The Work of WHO in the Eastern Mediterranean Region: Annual Report of the Regional Director. World Health Organization Regional Office for the Eastern Mediterranean, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.