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
Lane, W. Ronald, author
New York, 2000
Buku Teks
Ahuja, B. N., author
Surjeet Publications, 1989
Buku Teks