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Special UK Correspondent to the USMA. UK Metrication History and Status. www.us-metric.org. 美国公制协会（U.S. Metric Association）（英语：U.S. Metric Association）. [2019-01-18]
国际单位制
[2017-04-06]. （原始内容存档于2017-04-11） （波兰语）. U.S. Metric Association FAQ: Frequently Asked Questions about the metric system. [2016-05-04]. （原始内容存档于2015-12-11）
l'Automobile（英语：FISITA） SAE India（英语：SAE India） Euphemism and The Metric System - The Metric Maven. themetricmaven.com. [2017-08-05]. （原始内容存档于2017-08-06）.
Barking line, electric dreams do come true. CityMetric. 2018-06-11 [2018-09-12]. （原始内容存档于2020-08-08）. UK railway news round-up. Railway Gazette. 2019-01-31
发电成本
indication of economic competitiveness for each technology than either metric separately when several technologies are available to meet load. US Energy