linnemann, h., & youseef, m. N. (1965). a multiple-regression analysis of international trade flows its setup, up main results. National Planning Institute.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)linnemann, hans, و marry N. youseef. A Multiple-regression Analysis of International Trade Flows Its Setup, Up Main Results. cairo: National Planning Institute, 1965.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)linnemann, hans, و marry N. youseef. A Multiple-regression Analysis of International Trade Flows Its Setup, Up Main Results. National Planning Institute, 1965.