Hopp, Wallace J., author
Irwin, 1996
Buku Teks
Hopp, Wallace J., author
McGraw-Hill, 2000
Buku Teks
Vollmann, Thomas E., author
Business One Irwin, 1993
Buku Referensi
Mather, Hal, author
Prentice-Hall, 1988
Buku Teks
Lindbeck, John R., author
Prentice-Hall, 1990
Buku Teks