ဟက်ကာ: တည်းဖြတ်မှု မူကွဲများ

* Levy, Steven (2002). Crypto: How the Code Rebels Beat the Government Saving Privacy in the Digital Age. Penguin. ISBN 0-14-024432-8.

* Ventre, Daniel (2009). Information Warfare. Wiley - ISTE. ISBN 978-1-84821-094-3.