Rosiana Ambarwati, author
Universitas Indonesia, 2001
UI - Tesis (Membership)
Ganderton, Lucinda, author
Page One, 2002
Buku Referensi
Meredith, Carol, author
Rockport Publishers, 2000
Buku Referensi
Livingston, Kathryn
Rockport Publishers, 1999
Buku Teks
Massachusetts: Rockport Publishers,, 1997
Buku Teks