Ba Abd Allah، M. A.، و Wilkies، S. (2011). Critical Factors Affecting Project Managers: Understanding Risk Attitudes of Project Managers at Work in Saudi Arabia ( غير منشورة). Teesside University، ميدلزبره. مسترجع من http://search.mandumah.com/Record/607840
Ba Abd Allah، Mohammed Ali، و Steve Wilkies. "Critical Factors Affecting Project Managers: Understanding Risk Attitudes of Project Managers At Work in Saudi Arabia" . Teesside University، ميدلزبره، 2011. مسترجع من http://search.mandumah.com/Record/607840