Laplante, Philip A.: Dictionary of Computer Science, Engineering and Technology, s. 366. CRC Press, Dec 21, 2000. ISBN 0-8493-2691-5Teoksen verkkoversio (viitattu July 3, 2016). Arkistoitu September 3, 2016.
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Laplante, Philip A.: Dictionary of Computer Science, Engineering and Technology, s. 366. CRC Press, Dec 21, 2000. ISBN 0-8493-2691-5Teoksen verkkoversio (viitattu July 3, 2016). Arkistoitu September 3, 2016.