i. Calverton Parish Records; Page NT/REG/54817/1-23 Fiche 4; Text Oct 29 Samuel Son of William & Susanna Blacknall; [Source Record]; Certainty Unknown ('4')
ii. Research by Ronald Blacknell [208]; [Source Record]
iii. "Christening register for the parish of Calverton in Nottinghamshire covering 1744-1901," transciption database, Society of Genealogists; Page accessed 13 Jan 2020), Entry for Sarah Blacknall.; [Source Record]; Certainty Primary Evidence