- [S369] Plantagenet Roll of the Blood Royal Being A Complete Table of All the Descendants Now Living of Edward III, King of England, Melville Henry Massue, Marquis de Ruvigny et Raineval (1868-1921), (London: T.C. & E. C. Jack, 1905-11, scanned original pages on www.ancestry.co.uk, 2002;), p.139 (Reliability: 2).
- [S31] A Genealogical and Heraldic Dictionary of the Peerage and Baronetage of the British Empire, Sir Bernard Burke, (London: Harrison, 1865, scanned original pages on www.ancestry.co.uk, 2004;), pp.946-947 (Reliability: 2).
- [S122] Debrett's Peerage and Baronetage, (Debrett's Peerage Limited and Macmillan Publishers Ltd, 2000, retrieved from http://www.xreferplus.com;).
- [S205] FreeBMD, (www.freebmd.org.uk;), marriages of Lionel Seymour William Dawson Damer and Harriet Lydia Montagu share reference St Geo H Sq 1a 364, June quarter 1855 (Reliability: 3).