Elgar, Peter
Prentice-Hall, 1998
Buku Teks
editor, John G. Webster
CRC Press, 1999
Buku Referensi
Soloman, Sabrie, author
McGraw-Hill, 2010
Buku Teks
Cooke, Robert, author
Wiley-blackwell, 2009
Buku Teks
Anderson, Norman A., author
Chilton Book Company, 1980
Buku Teks