Theraja, B.L.
S. Chand & Company, 1996
Buku Teks
Tokheim, Roger L.
Jakarta Erlangga 1995,
Buku Teks
Gray, Harry B., editor
"Berlin: Walter de Gruyter, 1973",
Buku Teks
Deshpande, N.D.
Tata McGraw-Hill , 1995
Buku Teks
Kleitz, William
Upper Saddle River, N.J. Prentice Hall 1996,
Buku Teks