Nasif, A. A. (1988). AL-‘ULA: On system : an historical and archaeological survey with special reference to its irrigatin. king saud university.
Chicago-referens (17:e uppl.)Nasif, Abdallah Adam. AL-‘ULA: On System : An Historical and Archaeological Survey with Special Reference to Its Irrigatin. Riyadh: king saud university, 1988.
MLA-referens (9:e uppl.)Nasif, Abdallah Adam. AL-‘ULA: On System : An Historical and Archaeological Survey with Special Reference to Its Irrigatin. king saud university, 1988.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.