Lane, thomas
Conran Octopus, 1996
Buku Referensi
Berman, Alan
FrancesLincoln limited, 1997
Buku Teks
Stevenson, Maggie
Hongkong : Page One Publishing, 2002,
Buku Referensi
Stevenson, Maggie
Page one Publishing, 2002
Buku Referensi
Rusdi Tommy
Universitas Indonesia, 2004
UI - Skripsi Membership