el hefny, a. (1965). decision making systems in management. National Planning Institute.
Chicago-čujuhus (17. p.)el hefny, amina. Decision Making Systems in Management. cairo: National Planning Institute, 1965.
MLA-čujuhus (9. p.)el hefny, amina. Decision Making Systems in Management. National Planning Institute, 1965.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.