el-hefny, a. (1964). forecasting for management of seasonal goods inventories. National Planning Institute.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)el-hefny, amina. Forecasting for Management of Seasonal Goods Inventories. cairo: National Planning Institute, 1964.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)el-hefny, amina. Forecasting for Management of Seasonal Goods Inventories. National Planning Institute, 1964.