text: * Encyclopædia Britannica, 14th ed.
  * J. Day & R. F. Tylecote (eds.), The Industrial Revolution in Metals (1991)
  * P. W. King, "The Cupola at Bristol", Somerset Araeology and Natural History 140 (for 1997), 37–52
  * P. W. King, "Sir Clement Clerke and the Adoption of coal in metallurgy", Transactions of the Newcomen Society 73(1) (2001–2), 33–53