Ø§Ø¯Ø±ÙŠØ³, Ø., & Ø¨Ø±ÙŠØ±, Ø. 2011 Jan 1. Ø¯ÙˆØ± Ø§Ø³ØªØ±Ø§ØªÙŠØ¬ÙŠØ§Øª Ø§Ù„Ù…Ø²ÙŠØ¬ Ø§Ù„ØªØ³ÙˆÙŠÙ‚ÙŠ ÙÙŠ Ø±ÙØ¹ ÙƒÙØ§Ø¡Ø© Ø§Ù„Ù…Ù†Ø´Ø¢Øª Ø§Ù„ØºØ°Ø§Ø¦ÙŠØ©. Gezira Journal of Economic and Social Sciences. [Online] 2:1