Aljar Allah، A. u. M.، و Asutay، M. (2010). Analysing the Impact of the World Trade Organisation (WTO) on the Sustainability of Competitiveness of the Petrochemical Industry in Saudi Arabia (رسالة دكتوراه غير منشورة). Durham University، درم. مسترجع من http://search.mandumah.com/Record/603118
Aljar Allah، Abd ulaziz M.، و Mehmet Asutay. "Analysing the Impact of the World Trade Organisation (WTO) On the Sustainability of Competitiveness of the Petrochemical Industry in Saudi Arabia" رسالة دكتوراه. Durham University، درم، 2010. مسترجع من http://search.mandumah.com/Record/603118