Singh, Patwant
Distributed by Prisma, Aurelec, 1996
Buku Teks
Balakrishna, R.
Bangalore Printing & Pub. Co., 1948
Buku Teks
Knight, Henry.
Stanford University Press, 1954
Buku Teks
Chandrasekhar, S., author
University of North Carolina Press, 1972
Buku Teks
Aggarwal, J.C., author
Shipra, 1993
Buku Teks