Ganderton, Lucinda
Page One, 2002
Buku Referensi
Whately, Alice
Hongkong : Page One Publishing, 2002,
Buku Referensi
Shaw-Ros Byam
Hongkong : Page One Publishing, 2004,
Buku Referensi
Wening Nataningsih
Fakultas Teknik Universitas Indonesia, 2013
UI - Skripsi (Membership)
Bliss, Sara
Page One Publishing, 2003
Buku Referensi