{| class="wikitable" style="margin:1em auto 1em auto"
|+ الوحدات الأساسية ن د<ref name=sp330>{{مرجع كتاب|مؤلف=Barry N. Taylor & Ambler Thompson Ed.|عنوان=The International System of Units (SI)|origyear=2008|مسار=http://physics.nist.gov/Pubs/SP330/sp330.pdf|تاريخ الوصول=2008-06-18|ناشر=National Institute of Standards and Technology|مكان=Gaithersburg, MD|صفحات=23|مسار أرشيف=https://web.archive.org/web/20170622033951/http://physics.nist.gov/Pubs/SP330/sp330.pdf|تاريخ أرشيف=22 يونيو 2017|access-date=2019-12-24|archive-date=2016-06-03|archive-url=https://web.archive.org/web/20160603215953/http://physics.nist.gov/Pubs/SP330/sp330.pdf|url-status=dead}}</ref>
