Strahlem, Richard E.
Lexander Hamilton Institute , 1961
Buku Teks
Usry, Milton F., author
South Western, 1988
Buku Teks
Pacsy, Vivian A., author
McGraw-Hill, 1986
Buku Teks
Heitger, Lester E.
Ohio. South-Western Publishing Co., 1992
Buku Teks
Carter, William K., 1951-, author
Dame/Thomson Learning, 2002
Buku Teks