May, Thomas Erskine (1912) [1861]. Holland, Francis (ed.). The Constitutional History of England Since the Accession of George the Third, 1760–1860, continued to 1911. (3 vols.). London: Longmans, Green and Co. Vol. 1 • Vol. 2 • Vol. 3
The formal appointment, as Under Clerk of the Parliaments, was officially announced on 2 February. "No. 23702". The London Gazette. 3 February 1871. p. 383.
Leigh Rayment (1 September 2015). "Peerage Records". Leigh Rayment's Peerage Page. Archived from the original on 23 March 2016.{{cite web}}: CS1 maint: unfit URL (link)