Steiner, Bob, author
[Publisher not identified], [Date of publication not identified]
Buku Teks
edited by Alessandro Duranti
Blaxkwell , 2004
Buku Teks
Houghton, Diane, author
Gower, 1980
Buku Teks
Auerbach, Robert D., author
Macmillan, 1989
Buku Teks
Robinson, Roland I., author
McGraw-Hill , 1981
Buku Teks