Johnson, Robert, author
PWS-Kent, 1984
Buku Teks
Hoel, Paul Gerhard, 1905-, author
John Wiley & Sons, 1962
Buku Teks
Bowley, Arthur, author
Staples Press, 1948
Buku Teks
Freund, John E., author
Pearson Education, 2007
Multimedia
Freund, John E., author
Prentice-Hall, 1980
Buku Teks