McKay, Craig G., and Bengt Beckman. Swedish Signal Intelligence 1900-1945. London: Frank Cass, 2002.

Hess, JIH 3.1, calls this "an important account about ... Sigint as it developed in a medium-sized, neutral country of Europe.... This definitive, exhaustive and illuminating account draws on the official archives notably from Sweden and provides new and surprising results.... The centrepiece of the study ... is the Sigint contribution to Sweden's neutrality in two world wars, particularly in the second.... [T]he book is well presented and thoroughly edited."

For Van Nederveen, Air & Space Power Journal 17.3 (Fall 2003), this "first authoritative account of Sweden’s SIGINT [is] both valuable and unique.... The authors are to be commended for their detailed, up-front explanation of SIGINT: how radio and telegraph coding was used between various countries and their diplomatic missions, what kinds of transmissions third parties could intercept, and the numerous tasks involved in decoding that data.... SIGINT books are rare, and this one is a must-read for intelligence professionals.... Historians interested in World War II may even have to reconsider some events of that war after reading this book."

Kruh, Cryptologia 27.2, calls this work "a definitive account of the evolution of Swedish signal intelligence between 1900 and 1945.... It is an interesting and surprisingly revealing source of European cryptology in the first half of the twentieth century." To Erskine, I&NS 18.3, the authors "have researched their subject thoroughly and know it well." The work "deals mainly with the collection and breaking of messages and the establishment and organisation of the various bodies which were responsible for Sigint. It contains comparatively little on analysing the resulting intelligence, or how it was used by policy makers."

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