el-hefny, a. (1964). forecasting for management of seasonal goods inventories. National Planning Institute.
Cytowanie według stylu Chicago (wyd. 17)el-hefny, amina. Forecasting for Management of Seasonal Goods Inventories. cairo: National Planning Institute, 1964.
Cytowanie według stylu MLA (wyd. 9)el-hefny, amina. Forecasting for Management of Seasonal Goods Inventories. National Planning Institute, 1964.