Notes, it is appended in square brackets.
Papers in publicly accessible archives
Bodleian Library: papers of Margot Asquith, Countess of Oxford and Asquith, 1862–1945 [Bodleian, Asquith Papers, MS. Eng.]
British Library:
Avebury Papers
Papers of Arthur James Balfour
Burns Papers
Cockerell Papers
Eccles Bequest of Manuscripts (Lady Eccles Oscar Wilde Collection)
Papers of Allan Fea
Papers of Viscount and Viscountess Gladstone
Papers of Mary Gladstone (Mrs Drew)
Letters to John Lane
Papers of Robert Ross
Society of Authors Archive
Stopes Papers
Watts-Dunton Papers
Papers of Douglas Young
Fitzwilliam Museum, Cambridge: papers of Wilfrid Scawen Blunt [FM]
Hertford Archives and Local Records Office: papers of Lady Desborough [HALS DE/Rv]
National Records of Scotland (formerly the National Archives of Scotland):
Glenconner Papers: Papers of the Tennant Family of the Glen, Peebleshire, Lords Glenconner [NRS GD510]
Whittingehame Papers: Papers of Arthur James Balfour, first Earl of Balfour, and Viscount Traprain of Whittingehame [NRS GD433]
National Library of Scotland: Tennant Papers [NLS 12143/4]
Somerset Records Office: Papers of Evelyn, Lady de Vesci [DD/DRU]
The Times
Archive: http://www.thetimes.co.uk
National Census Archives: http://www.nationalarchives.gov.uk/records/census-records.htm
Papers in private collections
Adeane Papers: papers of Madeline and Charles Adeane
Petworth Papers: papers of Percy and Madeline Wyndham, by kind permission of Francis Wyndham and the Earl of Egremont
Stanway Papers: papers of Mary, Countess of Wemyss, held at Stanway House, Gloucestershire, in possession of the thirteenth Earl of Wemyss and March
Stephen Tennant Papers: formerly in the possession of Hugo Vickers, now predominantly at the Beinecke Rare Book and Manuscript Library, Yale University
George Wyndham Papers: papers of George Wyndham and Sibell, Countess Grosvenor
SECONDARY SOURCES
Books
Place of publication is London, unless otherwise stated.
Abdy, Jane and Gere, Charlotte,
The Souls
(Sidgwick & Jackson, 1984)
Adams, R. J. Q.,
Balfour: The Last Grandee
(John Murray, 2008)
Adelman, Paul,
Great Britain and the Irish Question
1800
–
1922
(Hodder & Stoughton, 1996)
Adler, Kathleen, Hirshler, Erica and Weinberg, H. Barbara (eds),
Americans in Paris
1860
–
1900, accompanying the exhibition
Americans in Paris
1860
–
1900
at the National Gallery, London; Museum of Fine Arts, Boston; and the Metropolitan Museum of Art, New York (National Gallery Company, 2006)
Airlie, Mabell, Countess of,
Thatched with Gold: The Memoirs of Mabell, Countess of Airlie
, ed. and arranged by Jennifer Ellis (Hutchinson, 1962)
Aldous, Richard,
The Lion and the Unicorn: Gladstone vs. Disraeli
(New York, W. W. Norton, 2007)
Appignanesi, Lisa,
Mad, Bad and Sad: A History of Women and the Mind Doctors from
1800
to the Present
(Virago, 2008)
Asquith, Lady Cynthia,
Diaries,
1915
–
1918
, ed. E. M. Horsley (New York, Alfred A. Knopf, 1969)
——,
Haply I May Remember
(James Barrie, 1950)
——,
Remember and Be Glad
(James Barrie, 1952)
Asquith, Margot,
An Autobiography
, 2 vols
(Thornton Butterworth, 1920–2)
——,
The Autobiography of Margot Asquith
, ed. with an introduction by Mark Bonham Carter
(Weidenfeld & Nicolson, 1995)
——,
More Memories
(Cassell, 1933)
——,
Myself When Young
(Frederick Muller, 1938)
——,
Off the Record
(Frederick Muller, 1944)
——,
Places and Persons
(Thornton Butterworth, 1922)
Baddeley, Hermione with Muriel Burgess,
The Unsinkable Hermione Baddeley
(Collins, 1984)
Bagehot, Walter,
The English Constitution
, ed. Miles Taylor (Oxford, Oxford University Press, 2001)
Balfour, Arthur James,
Chapters of Autobiography
, ed. Blanche Dugdale (Cassell, 1930)
Ball, Stuart,
The Conservative Party and British Politics
1902
–
1951
(London and New York, Longman, 1995)
Beauman, Nicola,
Cynthia Asquith
(Hamish Hamilton, 1987)
Begbie, Harold (as ‘A Gentleman with a