Johnstone, Ronald L.
Prentice-Hall, 1975
Buku Teks
Church, Richard
Methuen, 1951
Buku Teks
Kirby, James
Oxford University Press, 2016
eBooks
edited by Jean Woolmington
Cassell Australia, 1976
Buku Teks
Mitchell, Basil
Oxford University Press, 1970
Buku Teks