Cambridge University Press, 2007
eBooks
Gunter Narr Verlag, 1980
Buku Teks
Schutze, Ulf, author
Cambridge University Press, 2017
Buku Teks
Patrick Rebuschat, Detmar Meurers, Tony McEnery
Wiley , 2017
Buku Teks
August, Diane
Center for Applied Linguistics, 2006
Multimedia