C. Christhopher
Anmol Publicatioans PVT. ltd, 1997
Buku Teks
Ravindran, R.K.
Dominant Publishers & Distributors, 1999
Buku Referensi
Ravindran, R.K.
Dominant Publishers & Distributors, 1999
Buku Referensi
Ferguson, Donald L.
National Textbook, 1994
Buku Teks
Passante, Christopher K.
Prenada Media Group, 2008
Buku Teks