Tiwari, Rajnish, author
East-West Center, 2011
Buku Teks
Bachman, Richard, author
Dutton, 1996
Buku Teks
Potten, A.J. van, author
Rabobank International Group, 1966
Buku Teks
Government of India Press, 1965
Buku Teks
Bhalla, Subhash
Oxford Book & Stationery Co., 1969
Buku Teks