Stocker, Paul, 1971-, author
Cambridge University Press, 2012
Buku Teks
Miell, Anna, author
Routledge, 2006
Buku Teks
Prowe, Gunhild, author
Oxford University Press, 1995
Buku Referensi
Dreyer, Hilke, author
Verlag fur Deutsch , 1994
Buku Teks
Donaldson, Bruce, author
Routledge, 2006
Buku Teks