edited by Richard W. Bailey
Cambridge University Press , 1987
Buku Teks
Wells, Ronald A.
Mouton, 1973
Buku Teks
Potter, Simeon, author
Penguin Books, 1979
Buku Teks
Henning Bergenholtz, editor
Peter Lang, 2009
Buku Teks
Bobbs-Merrill Educational Publishing, 1979
Buku Teks