Palumbo, Dennis J., author
Harcourt Brace College, 1994
Buku Teks
Rourke, Francis E., author
Little, Brown, 1979
Buku Teks
Jones, Charles O.
Brooksm, 1977
Buku Teks
by James E. Anderson; David Brady; Charles Bullock III; Joseph stewart, JR
Brooks/Cole; cengage learning, 1984
Buku Teks
Hird, John A., author
Wadsworth , 2004
Buku Teks