Lipsey, Richard G., 1928-, author
Weidenfeld and Nicolson, 1972
Buku Teks
McEachern, William A., author
South-Western College Publishing, 1988
Buku Teks
Coyle, Diane, author
Texere, 2002
Buku Teks
Frain, H. LaRue
Hougton Mifflin Company, 1937
Buku Teks
McKenzie, Richard B., author
McGraw-Hill, 1978
Buku Teks