Data General Corporation, 1974
Buku Referensi
Harbison, Samuel P.
Prentice-Hall, 1995
Buku Referensi
Hughes, Charles E.
John Wiley & Sons, 1978
Buku Teks
Martin, E. Wainright
John Wiley & Sons, 1981
Buku Teks
Nanney, T. Ray
Prentice-Hall, 1981
Buku Teks