herausgegeben von Hartmut Günther, Otto Ludwig
Walter de Gruyter, 1994
Buku Referensi
Clark, Romy, author
Routledge, 1997
Buku Teks
Harris, Roy, author
Routledge, 1995
Buku Teks
Clark, Romy, author
Routledge, 1997
Buku Teks
Hyland, Ken, author
Longman, 2002
Buku Teks