"id","author_first1","author_last1","title","year","btitle","publisher","edition","place","pages","keyword0","keyword1","keyword2","keyword3","type" "1025","Robert B.","Serjeant","Customary law documents as a source of history","1979","Sources for the History of Arabia, part 2","Riyad University Press","1","Riyad","99-103","Aramawt","Customary","Law","Sana'a","chapter"