Roskill 1961, pp. 156, 170. Roskill, S.W. (1961). The War at Sea 1939–1945. Volume III: The Offensive Part II. History of the Second World War. London: Her Majesty's Stationery Office. OCLC59005418.
Roskill 1961, pp. 159–161. Roskill, S.W. (1961). The War at Sea 1939–1945. Volume III: The Offensive Part II. History of the Second World War. London: Her Majesty's Stationery Office. OCLC59005418.
Roskill 1961, pp. 156, 161. Roskill, S.W. (1961). The War at Sea 1939–1945. Volume III: The Offensive Part II. History of the Second World War. London: Her Majesty's Stationery Office. OCLC59005418.
Roskill 1961, p. 156. Roskill, S.W. (1961). The War at Sea 1939–1945. Volume III: The Offensive Part II. History of the Second World War. London: Her Majesty's Stationery Office. OCLC59005418.
Webster & Frankland 1961, p. 193. Webster, Charles; Frankland, Noble (1961). The Strategic Air Offensive Against Germany, Volume III: Victory. History of the Second World War. London: Her Majesty's Stationery Office. OCLC614956318.
Webster & Frankland 1961, p. 194. Webster, Charles; Frankland, Noble (1961). The Strategic Air Offensive Against Germany, Volume III: Victory. History of the Second World War. London: Her Majesty's Stationery Office. OCLC614956318.
Roskill 1961, p. 162. Roskill, S.W. (1961). The War at Sea 1939–1945. Volume III: The Offensive Part II. History of the Second World War. London: Her Majesty's Stationery Office. OCLC59005418.