Nasif, A. A. (1988). AL-‘ULA: On system : an historical and archaeological survey with special reference to its irrigatin. king saud university.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNasif, Abdallah Adam. AL-‘ULA: On System : An Historical and Archaeological Survey with Special Reference to Its Irrigatin. Riyadh: king saud university, 1988.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNasif, Abdallah Adam. AL-‘ULA: On System : An Historical and Archaeological Survey with Special Reference to Its Irrigatin. king saud university, 1988.
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