Grossberg, Alan B.
McGraw-Hill, 1971
Buku Teks SO
Kennedy, Michael
Prentice-Hall, 1975
Buku Teks SO
Rice, John K.
Holt, Rinehart and Winston , 1973
Buku Teks SO
McCracken, Daniel D.
John Wiley & Sons, 1974
Buku Referensi
Data General Corporation, 1974
Buku Referensi