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Proper reference for the International System of Units

I would like to cite a relevant document that guides usage of SI units. It seems like currently there are two nearly identical literature sources:

  1. 8th edition of SI Brochure issued by BIPM, 2006;
  2. NIST special Publication 330 "The International System of Units", 2008.

Which one should be used for the reference? Also, both of them lack IDs such as ISBN or DOI (I cannot find any), so how to cite the right source (preferably BibLaTeX example, if possible)?