Oberg, Erik; Franklin D., Jones; Horton, Holbrook L.; Ryffel, Henry H. (2012). McCauley, Christopher J. (ed.). Machinery's Handbook(PDF) (29th ed.). New York: Industrial Press. pp. 2451–2452. ISBN978-1-61344-859-5. OCLC802251511. Archived from the original(PDF) on 2020-11-19.
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Oberg, Erik; Franklin D., Jones; Horton, Holbrook L.; Ryffel, Henry H. (2012). McCauley, Christopher J. (ed.). Machinery's Handbook(PDF) (29th ed.). New York: Industrial Press. pp. 2451–2452. ISBN978-1-61344-859-5. OCLC802251511. Archived from the original(PDF) on 2020-11-19.
Oberg, Erik; Franklin D., Jones; Horton, Holbrook L.; Ryffel, Henry H. (2012). McCauley, Christopher J. (ed.). Machinery's Handbook(PDF) (29th ed.). New York: Industrial Press. pp. 2451–2452. ISBN978-1-61344-859-5. OCLC802251511. Archived from the original(PDF) on 2020-11-19.