Thorpe, Brian, author
[Gower, ], 2005
eBooks
Asfahl, C. Ray, author
Pearson/Prentice Hall, 2004
Buku Teks
Asfahl, C. Ray, author
Pearson Education, 2004
Multimedia
Dewis, M., author
MacDonald and Evans, 1978
Buku Teks
Stranks, Jeremy W., author
Pitman, 1994
Buku Teks