Werbach, Melvyn R.
Thorsons, 1993
Buku Referensi
Heinerman, John
Prentice Hall, Paramus, N.J., 1998
Buku Teks SO
Murray, Michael T.
Three Rivers Press, 1996
Buku Teks
Stevenson, Gladys T.
John Wiley & Sons, 1960
Buku Teks
edited by Derek P. Atherton, Pierre Borne
Pergamon Press, 1992
Buku Referensi