Gilmore, Grant
Ohio State University Press, 1995
Buku Teks
Rosenberg, Jerry
Ramdom House, 1969
Buku Teks
Gilmore, Grant
Ohio State University Press, 1974
Buku Teks
Crystal, David, 1941-, author
Cambridge University Press, 2004
Buku Teks
Conrad, Barnaby
Cambridge, The reverside Press 1958
Buku Teks