Cambridge University Press, 2010
eBooks
Cambridge University Press, 2003
eBooks
Goddard, Cliff, author
Oxford University Press, 2014
Buku Teks
Ilham Saiful Mubin, author
2014
UI - Skripsi (Membership)
Kartika Putri, auhtor
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2015
UI - Skripsi (Membership)