Brown, William, author
John Wiley & Sons, 2005
Buku Teks
Fessenden, Ralph J., author
Erlangga, 1986
Buku Teks
Solomons, T. W. Graham, author
John Wiley & Sons, 1979
Buku Teks
editor, Eric Reid
Ellis Horwood, 1981
Buku Referensi
Morrison, Robert Thornton, author
Prentice Hall of India, 1990
Buku Referensi