Iowa : The Torch Press
Majalah, Jurnal, Buletin
The University of Chicago Press, 1978
Majalah, Jurnal, Buletin
Bowra, C. M., author
Time-Life Books, 1965
Buku Teks
Cotterell, John, author
Lorenz Books, 2000
Buku Referensi
Kibble, T.W.B., author
Longman, 1985
Buku Teks