recovered by Sir Aurel Stein; described by Fred H. Andrews
Oxford Universityu Press, 1948
Buku Referensi
Federal Ministry of Information., 1962
Buku Teks
Arabian Encyclopaedia House, 2001
Buku Referensi
Spear, Percival, author
The University of Michigan Press, 1961
Buku Teks
Conze, Edward, 1904-1979, author
George Allen and Unwin, 1956
Buku Teks