Palmer, Norman D.
Houghton Mifflin, 1961
Buku Teks
Palmer, Norman D.
Houghton Mifflin, 1971
Buku Teks
Lok Sabha Secretariiat, 2002.
Buku Teks
Frankel, Francine R., author
Princenton University Press, 1978
Buku Teks
Pylee, M.V.
Asia Publishing House, 1960
Buku Teks