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توثيق أسلوب شيكاغو (الطبعة السابعة عشر).Siegel, Jacob S. Applied Demography: Applications to Business, Government, Law and Public Policy. San Diego: Academic Press, 2002.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع).Siegel, Jacob S. Applied Demography: Applications to Business, Government, Law and Public Policy. Academic Press, 2002.