el-hefny, a. (1964). forecasting for management of seasonal goods inventories. National Planning Institute.
Lua i Stíl Chicago (17ú heag.)el-hefny, amina. Forecasting for Management of Seasonal Goods Inventories. cairo: National Planning Institute, 1964.
Lua MLA (9ú heag.)el-hefny, amina. Forecasting for Management of Seasonal Goods Inventories. National Planning Institute, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.