Mueller, John (1991). "Pearl Harbor: Military Inconvenience, Political Disaster". International Security. 16 (3 (Winter, 1991–1992)). The MIT Press: 176–177. doi:10.2307/2539091. JSTOR2539091. S2CID153949177.
Congress of the United States, Seventy-Ninth Congress (1946), Report of Navy Court of Inquiry, Hearings Before the Joint Committee on the Investigation of the Pearl Harbor Attack, Part 39: Reports, Findings, and Conclusions of Roberts Commission, Army Pearl Harbor Board, Navy Court of Inquiry, and Hewitt Inquiry, With Endorsements, Government Printing Office, pp. 297, 318–321
Congress of the United States, Seventy-Ninth Congress (1946), Fourth Endorsement to Record of Proceedings of Pearl Harbor Court of Inquiry, Hearings Before the Joint Committee on the Investigation of the Pearl Harbor Attack, Part 39: Reports, Findings, and Conclusions of Roberts Commission, Army Pearl Harbor Board, Navy Court of Inquiry, and Hewitt Inquiry, With Endorsements, Government Printing Office, pp. 373, 375–377, 381–383
jstor.org
Mueller, John (1991). "Pearl Harbor: Military Inconvenience, Political Disaster". International Security. 16 (3 (Winter, 1991–1992)). The MIT Press: 176–177. doi:10.2307/2539091. JSTOR2539091. S2CID153949177.
"Pearl Harbor Review". NSA.gov. National Security Agency. May 3, 2016. Retrieved December 8, 2017. Army communications to Hawaii were down due to technical problems, and the warning was sent -- via Western Union telegram!
semanticscholar.org
api.semanticscholar.org
Mueller, John (1991). "Pearl Harbor: Military Inconvenience, Political Disaster". International Security. 16 (3 (Winter, 1991–1992)). The MIT Press: 176–177. doi:10.2307/2539091. JSTOR2539091. S2CID153949177.