APA (7th ed.) Citation

Welsh, D. J. A. (1988). Codes and cryptography. Clarendon Press.

Chicago Style (17th ed.) Citation

Welsh, D. J. A. Codes and Cryptography. Oxford: Clarendon Press, 1988.

MLA (9th ed.) Citation

Welsh, D. J. A. Codes and Cryptography. Clarendon Press, 1988.