APA Citation

Beker, H. P. Cipher Systems: The Protection of Communications. Northwood Publications, London, 1982.

Chicago Style Citation

Beker, Henry; Piper. Cipher Systems: The Protection of Communications. Northwood Publications, London, 1982.

MLA Citation

Beker, Henry; Piper. Cipher Systems: The Protection of Communications. Northwood Publications, London, 1982.

Warning: These citations may not always be 100% accurate.