Sharma, S.R.
Orient Longmans Ltd, 1951
Buku Teks
Palmer, Alan, author
Routledge, 1996
Buku Referensi
Peyser, Ethel, author
G.P. Putnam's Sons, 1956
Buku Teks
Brenan, Gerald, author
At The University Press, 1951
Buku Teks
Keegan, John, author
Routledge, 1996
Buku Referensi