Weiss, Neil
Addison-Wesley Pub. Co., 1982
Buku Teks
Johnson, Robert, author
PWS-Kent, 1984
Buku Teks
Bowley, Arthur, author
Staples Press, 1948
Buku Teks
Fleming, Michael C., author
Rouledge, 1994
Buku Teks
Berenson, Mark L., author
Prentice-Hall, 1988
Buku Teks