Ø§Ù„ÙƒØ±Ø³Ù†ÙŠ, Ø., & Ø´ÙƒØ±Øª Ø§Ù„Ù„Ù‡, Ø. 2010 Jan 1. Ù…Ø¹ÙˆÙ‚Ø§Øª Ø§Ù„ØªØ®Ø·ÙŠØ· Ø§Ù„Ø¥Ø³ØªØ±Ø§ØªÙŠØ¬ÙŠ ÙÙŠ Ø§Ù„Ù…Ø¤Ø³Ø³Ø§Øª Ø§Ù„Ø¹Ø§Ù…Ø©. Gezira Journal of Economic and Social Sciences. [Online] 1:1