Wilson, Alastair (22 de julio de 2009). «'Knots an hour'». The Kipling Society. Consultado el 1 de diciembre de 2012. «Since the 1890s or thereabouts, it has been drummed into the young seaman that a knot is a unit of speed, namely, one nautical mile per hour; and that consequently only the uneducated speak of "knots per hour" or "knots an hour". It was therefore inevitable that Kipling’s frequent use of this expression should grieve a number of seafaring readers, as the pages of the Kipling Journal testify.»
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physics.nist.gov
Louis E. Barbow and Lewie V. Judson (1976). «Appendix 4 The international nautical mile». Weights and Measures Standards of the United States, A brief history(en inglés). NIST Physics Laboratory. Archivado desde el original el 26 de septiembre de 2007. Consultado el 2 de agosto de 2007.
Louis E. Barbow and Lewie V. Judson (1976). «Appendix 4 The international nautical mile». Weights and Measures Standards of the United States, A brief history(en inglés). NIST Physics Laboratory. Archivado desde el original el 26 de septiembre de 2007. Consultado el 2 de agosto de 2007.
