- [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.1111-1112 (Reliability: 2).
- [S195] International Genealogical Index, The Church of Jesus Christ of Latter-Day Saints, (www.familysearch.org;), baptism of Walter Calverly Trevelyan, child of Walter Trevelyan and Margaret Hitchins, born 14 July 1807 (extracted) (Reliability: 2).
- [S223] Information from Alan Turrell, email dated 17 February 2006, citing "The Descendants of Charles Hobbs 1596-1700" (privately published, 1914) (Reliability: 2).
"John Pearson Cresswell, b. 13 May 1833, d. 6 Jan 1905; m. 2 Sept 1862, Margaret Lydia Trevelyan b. 15 July 1844, d. 24 Feb 1897; and in a footnote: J. P. Cresswell. M.R.C.S., of Steeple Aston, Oxfordshire, married at Seaton, Devon, Margaret Lydia, second daughter of the late Walter Calverley Trevelyan, Esq., of Manor House Seaton and Nether Witton Hall, Northumberland"
- [S205] FreeBMD, (www.freebmd.org.uk;), death registration of Walter Calverley Trevelyan, Axminster 10 7, March quarter 1850 (Reliability: 3).