Clark, Lawrence S.
McGraw-Hill, 1991
Buku Teks
Buttler, Henry N.
South-Western Publishing Co., 1987
Buku Teks
Blackburn, John D.
Richard D. Irwin , 1985
Buku Teks
Hancock, William A.
McGraw-Hill, 1982
Buku Teks
Lieberman, Jethro K.
Harcourt Brace Jovanovic, 1989
Buku Teks