Matzner, Richard A., author
Prentice-Hall, 1991
Buku Teks
Iowa : The Torch Press
Majalah, Jurnal, Buletin
The University of Chicago Press, 1978
Majalah, Jurnal, Buletin
Cotterell, John, author
Lorenz Books, 2000
Buku Referensi
Kibble, T.W.B., author
Longman, 1985
Buku Teks