Payne, James
Illinois National Textbook, 1994
Buku Teks
Olsen, Gary
Ohio North Light Books , 1997
Buku Teks
Davis, William S.
Addison-Wesley , 1988
Buku Teks
Rougier, Harry
W.W. Norton, 1970
Buku Teks
Weiss, Alan
John Wiley & Sons, 2009
Buku Referensi