Keyes Papers. Vol. ii. Correspondence with Admiral of the Fleet David Beatty, 1st Earl Beatty of the North Sea and of Brooksby, Naval Secretary to 1st Lord of the Admiralty (1912-1913), commanded Battle Cruiser Squadron (1913-1916), C-in-C Grand Fleet (1916-1919), Admiral of the Fleet (1919), 1st Sea Lord (1919-1927); 1905-1933, n.d.
Admiral of the Fleet Roger John Brownlow Keyes, 1st Baron Keyes: Admiral of the Fleet David Beatty, 1st Earl Beatty: Correspondence of Adm. of the Fleet Roger John Brownlow Keyes and Adm. of the Fleet David Beatty: 1905-1933, n.d.