Forrest 1865, pp. 528–531. Forrest, James, ed. (1865). "Abstracts of the discussions session 1864-1865". Minutes of the Proceedings of the Institution of Civil Engineers. 24. Institution of Civil Engineers. doi:10.1680/imotp.1865.23264.
Mander 1824, pp. 1–2. Mander, James (1824). The Derbyshire miners' glossary, or, An explanation of the technical terms of the miners. Bakewell, Derbyshire: James Mander. OCLC65253257.
Hebert 1839, p. 554. Hebert, Luke (1839). "Joseph Gibbs and Augustus Applegarth". The Engineers and Mechanics Encyclopedia. London: Thomas Kelly. OCLC662598515.