"England and Wales Birth Registration Index, 1837-2008," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2XLV-Z9J : accessed 21 May 2016), Astley Dundas C Key, 1884; from "England & Wales Births, 1837-2006," database, findmypast (http://www.findmypast.com : 2012); citing Birth Registration, Strand, London, England, citing General Register Office, Southport, England.
"England and Wales Census, 1891," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:4Z19-2ZM : accessed 21 May 2016), Astley D Cooper Key in household of Evelyn Cooper Key, Eastbourne, Sussex, England; from "1891 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 12, Sussex county, subdistrict, The National Archives of the UK, Kew, Surrey.