Carl Theophilus Odhner, Annals of the New Church (1904), p. 241;archive.org.
Roger Cooter, The Cultural Meaning of Popular Science: phrenology and the organization of consent in nineteenth-century Britain (1984), p. 285; Internet Archive.
The Christian Physician and Anthropological Magazine (1835); archive.org.
A. W. Skempton (editor), A Biographical Dictionary of Civil Engineers in Great Britain and Ireland: 1500–1830 (2002), pp. 305–6; Google Books.
Monthly Magazine and British Register, vol. 25 (1808), p. 445; Google Books.
The Phrenological Journal and Miscellany, vol. 7 (1832),p. 14; Google Books.
The Intellectual Repository for the New Church (July/Sept. 1817), continued as The Intellectual Repository and New Jerusalem Magazine (1839) p. 277; Google Books.
The Phrenological Journal and Miscellany, no. 49, vol. 10 (1837)), p. 244; Google Books.
Charles H. Kaufman, Music in New Jersey, 1655–1860: a study of musical activity and musicians in New Jersey from its first settlement to the Civil War (1981), p. 161; Google Books.
Murphy D. Smith, Due Reverence: antiques in the possession of the American Philosophical Society (1992), p. 37; Google Books.
David Getsy, Sculpture and the Pursuit of a Modern Ideal in Britain, c. 1880–1930 (2004), p. 142; Google Books.
Peter J. Lineham, The Origins of the New Jerusalem Church in the 1780s, Bulletin of the John Rylands Library. 1988;70(3):109–122; online as PDF, at pp. 115–6.
US Patent 5271289Archived 12 June 2011 at the Wayback Machine – Non-involute gear, with reference to Hawkins's translation of "A Treatise on the Teeth of Wheels"
US Patent 5271289Archived 12 June 2011 at the Wayback Machine – Non-involute gear, with reference to Hawkins's translation of "A Treatise on the Teeth of Wheels"