Ferguson, Eugene S.; 228, paper 27, pp. 185-230 (1962). «Kinematics of Mechanisms from the Time of Watt». United States National Museum Bulletin228: 185-230. Consultado el 12 de mayo de 2013.La referencia utiliza el parámetro obsoleto |coautores= (ayuda)
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(British Patent 1432, April 28, 1784). Top left, straight-line linkage. Reproduced in Mechanical Inventions of James Watt, Volume III, James Patrick Muirhead, 1864. John Murray. Immediate source http://www.gutenberg.org/files/27106/27106-h/27106-h.htm Kinematics of Mechanisms from the Time of Watt, Ferguson, Eugene S. United States National Museum Bulletin, 228, paper 27, pp. 185-230, Washington: Smithsonian Institution Press, 1962
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Franz Reuleaux, The Kinematics of Machinery (1876), page 4.