George, F.H., author
Pergamon Press, 1968
Buku Teks
Harms, Edward, author
John Wiley & Sons, 1977
Buku Teks
Zelle, John, author
Franklin, Beedle and Associates, 2010
Buku Teks
Deitel, Harvey M., 1945-, author
Prentice-Hall, 1977
Buku Teks
Smith, T.C., author
Gordon and Breach Science , 1973
Buku Teks