Gary E. Weir Silent Defense One Hundred Years of the American Submarine Force互联网档案馆的存檔,存档日期2013-08-23., U.S. Naval Historical Center, Section "Shaping an Identity". Accessed 25 April 2008. "Thus, when Admiral Thomas Hart proclaimed unrestricted submarine warfare against Japan on, it came as no surprise"
web.archive.org
L, Klemen. Admiral Thomas Charles Hart. Forgotten Campaign: The Dutch East Indies Campaign 1941-1942. 1999–2000 [2014-07-05]. (原始内容存档于2012-12-04).
Gary E. Weir Silent Defense One Hundred Years of the American Submarine Force互联网档案馆的存檔,存档日期2013-08-23., U.S. Naval Historical Center, Section "Shaping an Identity". Accessed 25 April 2008. "Thus, when Admiral Thomas Hart proclaimed unrestricted submarine warfare against Japan on, it came as no surprise"
webs.com
dutcheastindies.webs.com
L, Klemen. Admiral Thomas Charles Hart. Forgotten Campaign: The Dutch East Indies Campaign 1941-1942. 1999–2000 [2014-07-05]. (原始内容存档于2012-12-04).