Padron:SIbrochure8th
International Bureau of Weights and Measures (2006), The International System of Units (SI) (PDF) (ika-8th (na) edisyon), ISBN 92-822-2213-6, inarkibo mula sa orihinal (PDF) noong 2017-08-14 {{citation}}: Unknown parameter |dead-url= ignored (|url-status= suggested) (tulong)CS1 maint: date auto-translated (link)
