Nagaraja, N.S.
New Delhi Tata Mc-Graw-Hill 1995,
Buku Teks
Theraja, B.L.
S. Chand & Company, 1996
Buku Teks
Tokheim, Roger L., author
Jakarta Erlangga 1995,
Buku Teks
Gray, Harry B.
"Berlin: Walter de Gruyter, 1973",
Buku Teks
Deshpande, N.D.
Tata McGraw-Hill , 1995
Buku Teks