References
- 1977 . Le Système International d’ Unités (SI) , 3e édition , 43 Sèvres, , France : Bureau International des Poids et Mésures .
- The International System of Units (SI), an English translation of the preceding text, published independently by Her Majesty's Stationery Office, UK, and by the National Bureau of Standards, USA (NBS Special Publication 330, 1977 edition, 41 pp.).
- 1975 . Quantities, Units, and Symbols , 2nd edition , 54 London : Royal Society .