Longman , 1995
Buku Teks
Dickinson, Markus, author
Wiley-Blackwell, 2013
Buku Teks
Masterman, Margaret, author
Cambridge University Press, 2005
eBooks
edited by Alexander Gelbukh
Springer-Verlag, 2012
eBooks
edited by Alexander Gelbukh
Springer-Verlag, 2012
eBooks