%% You should probably cite rfc5965 instead of this I-D.
@techreport{ietf-marf-base-06,
    number =    {draft-ietf-marf-base-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-marf-base/06/},
    author =    {Murray Kucherawy and Yakov Shafranovich and John R. Levine},
    title =     {{An Extensible Format for Email Feedback Reports}},
    pagetotal = 25,
    year =      2010,
    month =     may,
    day =       21,
    abstract =  {This document defines an extensible format and MIME type that may be used by mail operators to report feedback about received email to other parties. This format is intended as a machine-readable replacement for various existing report formats currently used in Internet email. {[}STANDARDS-TRACK{]}},
}