[ABRA 95]	M.D. Abrams, H.J. Podell:	Malicious Software. Information Security. IEEE Computer Society Press, 1995.
[ANDRE 88]	Karl Andreassen:	Computer Cryptology: Beyond Decoder Rings Prentice-Hall, 1988.
[APPL]		Applied Cryptology, Cryptographic Protocols and Computer Security Models American Mathematical Society, 1983.
[ARENS 21]	Walter Arensberg:	"The Cryptography of Dante" New York, Alfred A. Knopf, 1921.
[ASHBY 72]	W.Ross Ashby:	Bevezetés a kibernetikába Akadémiai Kiadó, Budapest, 1972.