APA (7th ed.) Citation

International Bureau of Weights and Measures, National Physical Laboratory (Great Britain), & Bell, R. J. (1993). SI: The international system of units : approved translation of the International Bureau of Weights and Measures publication 'Le Système International d'Unités (SI)' (6th ed.). HMSO.

Chicago Style (17th ed.) Citation

International Bureau of Weights and Measures, National Physical Laboratory (Great Britain), and R. J. Bell. SI: The International System of Units : Approved Translation of the International Bureau of Weights and Measures Publication 'Le Système International D'Unités (SI)'. 6th ed. London: HMSO, 1993.

MLA (8th ed.) Citation

International Bureau of Weights and Measures, et al. SI: The International System of Units : Approved Translation of the International Bureau of Weights and Measures Publication 'Le Système International D'Unités (SI)'. 6th ed. HMSO, 1993.