Fairhead, J. N.
English Universities Press, 1965
Buku Teks
Emerald Publishing Limited, 2019
eBooks
Bottomley, A. Keith, author
Pitman Press, 1978
Buku Teks
Mockler, Robert J., author
Prentice-Hall, 1989
Buku Teks
Mantel, Samuel J., author
Prentice-Hall, 1964
Buku Teks