i. "Transcribed entries in the Parish Registers and non-conformist registers of Nottinghamshire," burials database v8.0; Page accessed 19 Apr 2020), entry for William Blacknell, aged 4.; [Source Record]; Certainty Primary Evidence
ii. Death Certificates.; Page death certificate for William Blacknell, died 7 Jan 1849; Basford registration district, Arnold sub-district; [Source Record]; Certainty Unknown ('4')