Popham, W. James, author
Rineka Cipta, 2005
Buku Teks
Rosita Astri Kirana, author
Universitas Indonesia, 2014
UI - Skripsi (Membership)
Shastia Hadiarti, author
Universitas Indonesia, 2010
UI - Tesis (Open)
Dickinson, Leslie, author
Cambridge University Press , 1987
Buku Teks
Gredler, Margaret E., author
Kencana, 2011
Buku Teks