1. Admiralty Office 1761 The London Gazette https://www.thegazette.co.uk/London/issue/10070
2. Annual Register, or A View of the History, Politicks, and Literature of the Year 1761 1762 https://books.google.co.uk
3. Babcock , Todd M. Stargazers, Ax-men and Milkmaids: The Men who Surveyed Mason and Dixon's Line 2002
4. Babcock , Todd M. Good Horses and Agreeable Companions: The Search for the Observatory in Ye Forks of the Brandiwine 2007