%% You should probably cite draft-iab-fiftyyears instead of this I-D.
@techreport{flanagan-fiftyyears-00,
    number =    {draft-flanagan-fiftyyears-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-flanagan-fiftyyears/00/},
    author =    {Heather Flanagan},
    title =     {{Fifty Years of RFCs}},
    pagetotal = 16,
    year =      ** No value found for 'doc.pub_date.year' **,
    month =     ** No value found for 'doc.pub_date' **,
    day =       ** No value found for 'doc.pub_date.day' **,
    abstract =  {This RFC marks the fiftieth anniversary for the RFC Series. It includes both retrospective material from individuals involved at key inflection points, as well as a review of the current state of affairs. It concludes with thoughts on possibilities for the next fifty years for the Series.},
}