Smallwood, Robert F
Bacchus Books, 2016
Buku Teks SO
Synnott, William R.
John Wiley & Sons, 1981
Buku Teks SO
Bawden, David
Butterworth, 1990
Buku Teks SO
Earl, Michael J.
Prentice-Hall, 1989
Buku Teks SO
edited by Ralph H. Sprague and Barbara C. McNurlin
Prentice-Hall International, 1993
Buku Teks SO