Hemming, 1998
Multimedia
London: Tiger Books International, 1994,
Buku Referensi
Armstrong, James W., author
Macmillan, 1976
Buku Teks
Campbell, Hugh G., author
Macmillan, 1974
Buku Teks
Rothenberg, Ronald I., author
John Wiley & Sons, 1980
Buku Teks