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The Christian Physician and Anthropological Magazine (1835); archive.org.
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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.
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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"
