Fairhead, J. N.
English Universities Press, 1965
Buku Teks
Corwin, Charles H., author
Prentice-Hall, 2001
Buku Teks
by Billie Ann Wilson ... [and others]
Prentice-Hall, 2007
Buku Teks
Shannon, Margaret T.
Prentice-Hall, 2001
Buku Referensi
Harris, Muriel, author
Prentice-Hall, 1997
Buku Referensi