"Patent Shaft". www.patentshaft.com. Retrieved 15 October 2018.
pmsa.org.uk
"Oldbury Ring". National Recording Project. Public Monument and Sculpture Association. Archived from the original on 26 September 2016. Retrieved 25 September 2016.
"Hand and Cross". National Recording Project. Public Monument and Sculpture Association. Archived from the original on 1 August 2017. Retrieved 31 July 2017.
"Oldbury Ring". National Recording Project. Public Monument and Sculpture Association. Archived from the original on 26 September 2016. Retrieved 25 September 2016.
"Hand and Cross". National Recording Project. Public Monument and Sculpture Association. Archived from the original on 1 August 2017. Retrieved 31 July 2017.