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|+ Y Saith Uned Sylfaenol SI<ref>Barry N. Taylor & Ambler Thompson Ed. The International System of Units (SI) [http://physics.nist.gov/Pubs/SP330/sp330.pdf.]{{Dolen marw|date=February 2021 |bot=InternetArchiveBot |fix-attempted=yes }} Adalwyd: Mehefin 2008; cyhoeddwr: National Institute of Standards and Technology, Gaithersburg, 2008</ref><ref>[http://old.iupac.org/publications/books/author/mills.html Quantities Units and Symbols in Physical Chemistry], IUPAC</ref>
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