NIST Special Publication 811, Guide for the Use of the International System of Units (SI)
Referencesedit
^Cardarelli, François (2003). Encyclopaedia of Scientific Units, Weights and Measures. London: Springer. pp. 48. ISBN 978-1-4471-1122-1.
^Gyllenbok, Jan (2018-04-12). Encyclopaedia of Historical Metrology, Weights, and Measures. Birkhäuser. ISBN 9783319667126.
^Bailey, John; Culley, George (1797). General View of the Agriculture of the County of Northumberland: Drawn Up for the Consideration of the Board of Agriculture and Internal Improvement. S. Hodgson.