Timberlake, Karen C., author
Pearson Benjamin Cummings, 2007
Buku Teks
Baum, Stuart J., author
Macmillan, 1993
Buku Teks
Brady, James E., author
John Wiley & Sons, 1981
Buku Teks
Burns, Ralph A., author
Prentice-Hall, 1995
Buku Teks
Brady, James E., author
John Wily & Sons, 1984
Buku Teks