Stein, Donald G., author
MacMillan Press , 1974
Buku Teks
recovered by Sir Aurel Stein; described by Fred H. Andrews
Oxford Universityu Press, 1948
Buku Referensi
Hertzman, Clyde
DC The International Bank for Reconstruction and Development , 1995
Buku Teks
edited by Ali Banuazizi, Myron Weiner
Indiana University Press, 1994
Buku Teks
Basu, S.K.
Asia Publishing House , 1967
Buku Teks