Robertson, Christopher R.
Edward Arnold, 1993
Buku Teks
Golding, E.W.
Pitman Paperbacks, 1970
Buku Teks
Braccio, Michael
Reston Publishing Company, Inc., 1978
Buku Teks
Bethune, James D.
Prentice-Hall, 1980
Buku Teks
Chapman, K.S.
Edward Arnold, 1964
Buku Teks