A., Mohammed O.; 						A, Murtada Kh..
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<strong>Gezira Journal of Economic and Social Sciences</strong>, [S.l.], v. 7, n. 2, jan. 2016.
ISSN 1858-6023. Available at: &lt;<a href="http://37.60.236.48/index.php/gjess/article/view/642" target="_new">http://37.60.236.48/index.php/gjess/article/view/642</a>&gt;. Date accessed: 03 june 2026.