Wells, Gordon
Hodder & Stroughton, 1999
Buku Teks
Schutze, Ulf, author
Cambridge University Press, 2017
Buku Teks
edited by Keith Cameron
Blackwell, 1989
Buku Teks
Dubin, Fraida, author
Cambridge University Press, 1986
Buku Teks
Levy, Michael, 1950-, author
Oxford University Press, 2004
Buku Teks