Russell, J. Thomas, author
Prentice-Hall, 1999
Buku Teks
Lane, Ronald W., author
Pearson Prentice-Hall, 2008
Buku Teks
Hotchkiss, George Burton, author
Alexander Hamilton Institute , 1961
Buku Teks
Wells, William D., author
Prentice-Hall, 2000
Buku Teks
Weilbacher, William M
Macmillan, 1979
Buku Teks