%% You should probably cite rfc4645 instead of this I-D.
@techreport{ietf-ltru-initial-06,
    number =    {draft-ietf-ltru-initial-06},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-ltru-initial/06/},
    author =    {Doug Ewell},
    title =     {{Initial Language Subtag Registry}},
    pagetotal = 7,
    year =      2005,
    month =     oct,
    day =       19,
    abstract =  {This memo defined the initial contents of the IANA Language Subtag Registry for use in forming tags for the identification of languages. Since the contents of this memo only served as a starting point for the registry, its actual contents have been removed before publication to avoid confusion. This memo provides information for the Internet community.},
}