Welsh, D. J. A. (1989). Codes and cryptography (Repr. with corrections.). Clarendon Press ; Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Welsh, D. J. A. Codes and Cryptography. Repr. with corrections. Oxford [Oxfordshire] : New York: Clarendon Press ; Oxford University Press, 1989.
Lua MLA (8ú heag.)Welsh, D. J. A. Codes and Cryptography. Repr. with corrections. Clarendon Press ; Oxford University Press, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.