Codes and ciphers.
APA Citation
D'Agapeyeff, A. (Alexander). (1971). Codes and ciphers. Ann Arbor, Mich.: Gryphon Books.
MLA Citation
D'Agapeyeff, A. (Alexander). Codes And Ciphers. Ann Arbor, Mich.: Gryphon Books, 1971.
Warning: These citations may not always be complete (especially for serials).