Al Subaih، T. A. A. A.، و Hamdan، M. A. (1997). Improvement of locally produced gasoline and studying its effects on both the performance of the engine and the environment (رسالة ماجستير غير منشورة). الجامعة الاردنية، عمان. مسترجع من http://search.mandumah.com/Record/554717
Al Subaih، Tareq Abd Alrahman Ali، و Mohammed Ahmed Hamdan. "Improvement of Locally Produced Gasoline and Studying Its Effects On Both the Performance of the Engine and the Environment" رسالة ماجستير. الجامعة الاردنية، عمان، 1997. مسترجع من http://search.mandumah.com/Record/554717