Anderson, Ian, author
Media masters publishing sdn. bhd., 2011
Buku Referensi
Ian Anderson
Media Master Pub., 2011
Buku Teks
Dickson, Paul, author
Facts on file, 1986
Buku Teks
Kahan, Barbara, author
HMSO , 1994
Buku Teks
Petre, Maya, author
ALbert Bonniers Forlag, 1958
Buku Teks