Kuhn, Albert J. (1984). "Dr. Johnson, Zachariah Williams, and the Eighteenth-Century Search for the Longitude". Modern Philology. 82 (1): 44. doi:10.1086/391344. JSTOR437673. S2CID161595034.
harvard.edu
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Gingerich, Owen (1996). "Cranks and opportunists: "Nutty" solutions to the longitude problem". The Quest for Longitude: The Proceedings of the Longitude Symposium: 134–148. Bibcode:1996long.symp..134G.
jstor.org
Kuhn, Albert J. (1984). "Dr. Johnson, Zachariah Williams, and the Eighteenth-Century Search for the Longitude". Modern Philology. 82 (1): 44. doi:10.1086/391344. JSTOR437673. S2CID161595034.
Kuhn, Albert J. (1984). "Dr. Johnson, Zachariah Williams, and the Eighteenth-Century Search for the Longitude". Modern Philology. 82 (1): 44. doi:10.1086/391344. JSTOR437673. S2CID161595034.