Zyman, Sergio, author
John Wiley & Sons, 2002
Buku Teks
Hofsoos, Emil
Gulf Publishing Company, 1970
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