Barston, R. P.
Longman, 1988
Buku Teks
Rana, Kishan S.
Manas, 2002
Buku Teks
Mattingly, Garrett, author
Jonathan Cape, 1970
Buku Teks
Passin, Herbert, author
Praeger, 1962
Buku Teks
Galbraith, John Kenneth, 1908-2006, author
Sinclair-Stevenson, 1994
Buku Teks