Phelan, Nancy
Oxford University Press, 1987
Buku Teks
edited and compiled by Mark Halloran
Prentice-Hall, 1991
Buku Teks
Symons, Julian, author
Arthur Barker, 1951
Buku Teks
Fielding, K.J., author
Longman, Green, 1953
Buku Teks
Roberts, Don D.
Mouton, 1973
Buku Teks