McNulty, James E., author
University of Pennsylvania Press, 1964
Buku Teks
Gedam, Ratnakar M
Deep & Deep Publications, 1987
Buku Teks
edited by Hans Gunter
Macmillan, 1973
Buku Teks
Turner, Louis
Hamish Hamilton , 1970
Buku Teks
Hudson, William J., author
John Wiley & Sons, 1993
Buku Teks