Winston Churchill's statement as President of the Air Council in War Office Departmental Minute (the original document is in the collection of Churchill Papers 16/16 at the Churchill Archives Centre in Cambridge), May 12, 1919.
Winston Churchill's speech to the Scottish Unionist Association in Edinburgh, Scotland (September 25, 1924), later published in "Winston S. Churchill: His Complete Speeches, 1897-1963" edited by Robert Rhodes James (Volume 4, p. 3472), 1974.
Sir Winston Churchill, Winston Churchill (1965). “Great destiny: sixty years of the memorable events in the life of the man of the century recounted in his own incomparable words”
Winston Churchill (1969). “History of the English Speaking Peoples: Based on the Text of 'A History of the English-speaking Peoples' by Sir Winston Churchill”