Hachenburger, Petra
Routledge, 2000
Buku Referensi
Jackson, Paul, author
Sweet & Maxwell, 1973
Buku Teks
Irving, W Washington
Boston [etc.] Houghton Mifflin [1922]
Buku Teks
Saunders, Joy, author
Berlitz, 1993
Buku Teks
Manchester Manchester University Press 1995,
Buku Teks