Office for Official Publications of the European Communities (2000).COUNCIL DIRECTIVE of December 20, 1979, on the approximation of the laws of the Member States relating to units of measurement and on the repeal of Directive 71/354/EEC. Available at NIST Web siteArchived 2007-02-06 at the Wayback Machine.. p. 4.
A METRIC AMERICA A decision whose time has come, Daniel V. De Simone, Director, U.S. Metric Study, National Bureau of Standards Special Publication 345 (NBS SP 345), July 1971
“The Metric System in the United States”. How Many? A Dictionary of Units of Measurement. ノースカロライナ大学チャペルヒル校 (August 8, 2000). 2013年1月21日閲覧。 “Henceforth it shall be the policy of the National Bureau of Standards to use the units of the International System (SI), as adopted by the 11th General Conference of Weights and Measures (October 1960), except when the use of these units would obviously impair communication or reduce the usefulness of a report.”
Office for Official Publications of the European Communities (2000).COUNCIL DIRECTIVE of December 20, 1979, on the approximation of the laws of the Member States relating to units of measurement and on the repeal of Directive 71/354/EEC. Available at NIST Web siteArchived 2007-02-06 at the Wayback Machine.. p. 4.
