„joule”. A new English dictionary on historical principles. The Clarendon press. јануар 1901. стр. 606.CS1 одржавање: Датум и година (веза)CS1 одржавање: Формат датума (веза)
„Units with special names and symbols; units that incorporate special names and symbols”. International Bureau of Weights and Measures. Архивирано из оригинала 28. 6. 2009. г. Приступљено 18. 3. 2015. „A derived unit can often be expressed in different ways by combining base units with derived units having special names. Joule, for example, may formally be written newton metre, or kilogram metre squared per second squared. This, however, is an algebraic freedom to be governed by common sense physical considerations; in a given situation some forms may be more helpful than others. In practice, with certain quantities, preference is given to the use of certain special unit names, or combinations of unit names, to facilitate the distinction between different quantities having the same dimension.”
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gallica.bnf.fr
"The unit of heat has hitherto been taken variously as the heat required to raise a pound of water at the freezing-point through 1° Fahrenheit or Centigrade, or, again, the heat necessary to raise a kilogramme of water 1° Centigrade. The inconvenience of a unit so entirely arbitrary is sufficiently apparent to justify the introduction of one based on the electro-magnetic system, viz. the heat generated in one second by the current of an Ampère flowing through the resistance of an Ohm. In absolute measure its value is 107 C.G.S. units, and, assuming Joule's equivalent as 42,000,000, it is the heat necessary to raise 0.238 grammes of water 1° Centigrade, or, approximately, the 1⁄1000th part of the arbitrary unit of a pound of water raised 1° Fahrenheit and the 1⁄4000th of the kilogramme of water raised 1° Centigrade. Such a heat unit, if found acceptable, might with great propriety, I think, be called the Joule, after the man who has done so much to develop the dynamical theory of heat."Carl Wilhelm Siemens, Report of the Fifty-Second Meeting of the British Association for the Advancement of Science. S. 6 f.
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Allen, H. S. (септембар 1943). „Nature 152, 354 (1943)”. Nature. 152 (3856): 354. S2CID4182911. doi:10.1038/152354a0.CS1 одржавање: Формат датума (веза)
The adoption of joules as units of energy, FAO/WHO Ad Hoc Committee of Experts on Energy and Protein, 1971. A report on the changeover from calories to joules in nutrition.
„Units with special names and symbols; units that incorporate special names and symbols”. International Bureau of Weights and Measures. Архивирано из оригинала 28. 6. 2009. г. Приступљено 18. 3. 2015. „A derived unit can often be expressed in different ways by combining base units with derived units having special names. Joule, for example, may formally be written newton metre, or kilogram metre squared per second squared. This, however, is an algebraic freedom to be governed by common sense physical considerations; in a given situation some forms may be more helpful than others. In practice, with certain quantities, preference is given to the use of certain special unit names, or combinations of unit names, to facilitate the distinction between different quantities having the same dimension.”