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Ronalds, B.F. (2019). "Bonnington Chemical Works (1822-1878): Pioneer Coal Tar Company". International Journal for the History of Engineering & Technology. 89 (1–2): 73–91. doi:10.1080/17581206.2020.1787807. S2CID221115202.
web.archive.org
Beeby, Ann (September 2017). "What did our Ancestors do?"(PDF). Dig This! The Newsletter of 3D Archaeological Society. p. 7. Archived from the original(PDF) on 2019-04-17. Retrieved 2022-08-11.