Singh, R.S.
Oxford & Ibh, 1982
Buku Teks
Singh, Balbir
Vikas Publishing House, 1982
Buku Teks
Singh, S. K.
Tata McGraw-Hill , 1995
Buku Teks
Singh, S. K., author
Tata McGraw-Hill, 2003
Buku Teks
Sastri, K. Sambasiva
Trivandrum Government Press 1935
Buku Teks