%% You should probably cite rfc5131 instead of this I-D.
@techreport{mcwalter-langtag-mib-03,
    number =    {draft-mcwalter-langtag-mib-03},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-mcwalter-langtag-mib/03/},
    author =    {David McWalter},
    title =     {{A MIB Textual Convention for Language Tags}},
    pagetotal = 6,
    year =      2007,
    month =     mar,
    day =       22,
    abstract =  {This MIB module defines a textual convention to represent BCP 47 language tags. The intent is that this textual convention will be imported and used in MIB modules that would otherwise define their own representation. {[}STANDARDS-TRACK{]}},
}