(3GdHMK GdYdei (B:s (3CUhd h bhGYO GdHMK h cJGHI GdJbGQjQ h GdHMhK (B/s - (3MehOg, eMeO Yajais (al-Qahirah : 'Ayn Shams, 1983)
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Keywords: Economic research; Research; Decision making