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
Bolton, William, 1933-
Longman Scientific & Technical, 1992
Buku Teks