Al Hajhouj، H. R.، و Nziramasanga، M. (1999). PUBLIC POLICY AND PRIVATE INVESTMENT IN ONE-BASED SECTOR ECONOMY OF DEVELOPING COUNTRIES: AN EMPIRICAL STUDY OF THE SAUDI ARABIAN PRIVATE INVESTMENT SECTOR (رسالة دكتوراه غير منشورة). Washington State University، بولمان. مسترجع من http://search.mandumah.com/Record/617184