Bliss, Sara, author
Page One Publishing, 2003
Buku Referensi
Rosiana Ambarwati, author
Universitas Indonesia, 2001
UI - Tesis (Membership)
Ganderton, Lucinda, author
Page One, 2002
Buku Referensi
Rocknow, H.K., author
Stuttman, 1954
Buku Teks
Lowell, Christopher, author
Discovery Books, 2000
Buku Teks