McKay, S. (2023). The hidden history of code-breaking: The secret world of cyphers, uncrackable codes, and elusive encryptions (First Pegasus Books cloth edition.). Pegasus Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMcKay, Sinclair. The Hidden History of Code-breaking: The Secret World of Cyphers, Uncrackable Codes, and Elusive Encryptions. First Pegasus Books cloth edition. New York: Pegasus Books, 2023.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMcKay, Sinclair. The Hidden History of Code-breaking: The Secret World of Cyphers, Uncrackable Codes, and Elusive Encryptions. First Pegasus Books cloth edition. Pegasus Books, 2023.
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