United Kingdom
The Churchill Archives Centre, Churchill College, University of Cambridge
Winston S. Churchill papers (Chartwell and Churchill Collections)
Lord Randolph Churchill papers
Lady Randolph Churchill papers
Lady Churchill (Clementine Spencer-Churchill) papers
John S. Churchill papers
W. H. Bernau papers
E. Marsh papers
The British Library, London
Macmillan & Co. papers
The Blenheim papers
Northcliffe papers
Fladgate LLP, London
Anthony Moir papers
Lloyds Banking Group Archives, London
Winston S. Churchill bank statements (by kind permission of the late Lady Soames)
Cox & Co. papers
Lloyds Bank papers
London Metropolitan Archives
GLC Architect’s Department papers
Hodder & Stoughton papers
Times Newspapers Ltd. Archive, News UK and Ireland London
The Times management papers
Private collection, England
Lord Camrose papers
Reading University (Special Collections), Reading
Macmillan & Co. papers
Longmans, Green & Co. papers
Rothschild Archives, London
Lord Randolph Churchill bank ledgers and accounts
Southampton University, Southampton
Mountbatten papers (Sir Ernest Cassel)
United States
Princeton University, New Jersey (Department of Rare Books and Special Collections)
Bernard M. Baruch papers (Seeley G. Mudd Manuscripts Library)
The Scribner Archive (Firestone Library)
Columbia University, New York (Rare Books and Manuscripts Library)
Daniel Longwell papers
Paul R. Reynolds papers
Averell Harriman papers
Belmont Family papers
Pulitzer papers
Hodder & Stoughton papers
Curtis Brown papers
Harvard University, Massachusetts (Houghton Library)
Houghton Mifflin papers
Yale University, Connecticut (Beinecke Rare Book & Manuscript Library)
Lady St Helier papers
Library of Congress, Washington, D.C.
Henry & Clare Luce papers
Moreton Frewen papers
New York Public Library, New York
Sir Edward Marsh papers
A. P. Watt papers