Data General Corporation, 1974
Buku Referensi
Harbison, Samuel P.
Prentice-Hall, 1995
Buku Referensi
Grossberg, Alan B.
McGraw-Hill, 1971
Buku Teks
Kennedy, Michael
Prentice-Hall, 1975
Buku Teks
Rice, John K.
Holt, Rinehart and Winston , 1973
Buku Teks