"id","author_first1","author_last1","title","year","btitle","beditor_first","beditor_last","publisher","place","pages","keyword0","type" "964","Wilferd","Madelung","Land ownership and land tax in Northern Yemen and Najran: 3rd-4th/9th-10th century","1984","Land Tenure and Social Transformation in the Middle East","Tarif","Khalidi","American University of Beirut","Beirut","189-207","Tribes","chapter"