Wilson, Alastair (22. 7. 2009). „'Knots an hour'”. The Kipling Society. Приступљено 1. 12. 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.”
nist.gov
physics.nist.gov
Louis E. Barbow and Lewie V. Judson (1976). „Appendix 4 The international nautical mile”(PDF). Weights and Measures Standards of the United States, A brief history. NIST Physics Laboratory. Архивирано из оригинала(PDF) 26. 09. 2007. г. Приступљено 02. 08. 2007.
web.archive.org
Louis E. Barbow and Lewie V. Judson (1976). „Appendix 4 The international nautical mile”(PDF). Weights and Measures Standards of the United States, A brief history. NIST Physics Laboratory. Архивирано из оригинала(PDF) 26. 09. 2007. г. Приступљено 02. 08. 2007.