Hotchkiss, George Burton
Alexander Hamilton Institute , 1961
Buku Teks
White, Roderick
McGraw-Hill, 2000
Buku Teks
Wells, William D.
Prentice-Hall, 2000
Buku Teks
Weilbacher, William M
Macmillan, 1979
Buku Teks
by John S. Wright ... [et.al.]
McGraw-Hill, 1977
Buku Teks