%% You should probably cite rfc3066 instead of this I-D.
@techreport{alvestrand-lang-tag-v2-04,
    number =    {draft-alvestrand-lang-tag-v2-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-alvestrand-lang-tag-v2/04/},
    author =    {Harald T. Alvestrand},
    title =     {{Tags for the Identification of Languages}},
    pagetotal = 13,
    year =      2000,
    month =     sep,
    day =       20,
    abstract =  {This document describes a language tag for use in cases where it is desired to indicate the language used in an information object, how to register values for use in this language tag, and a construct for matching such language tags. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.},
}