Louderback, Joseph G., III, author
Thomson/South-Western, 2003
Buku Teks
Dominiak, Geraldine F., author
PWS-Kent, 1991
Buku Teks
Helmkamp, John G., author
John Wiley & Sons, 1990
Buku Teks
Murphy, Mary E., author
Van Nostrand Reinhold, 1963
Buku Teks
Moore, Carl L., author
South-Western Publishing, 1972
Buku Teks