edited by Alfred M. Bork
Pergamon Press, 1980
Buku Teks
edited by R. Lewis and ED Tagg
Blackwell, 1987
Buku Teks
Beatty, Ken, author
Pearson Education, 2003
Buku Teks
edited by Keith Cameron
Blackwell, 1989
Buku Teks
Levy, Michael, 1950-, author
Oxford University Press, 2004
Buku Teks