%% You should probably cite rfc4839 instead of this I-D.
@techreport{conboy-mime-opf-00,
    number =    {draft-conboy-mime-opf-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-conboy-mime-opf/00/},
    author =    {Garth Conboy and Jon Ferraiolo and John Rivlin},
    title =     {{Media Type Registrations for the Open eBook Publication Structure (OEBPS) Package File (OPF)}},
    pagetotal = 5,
    year =      2006,
    month =     oct,
    day =       6,
    abstract =  {This document serves to register a media type for the Open eBook Publication Structure (OEBPS) Package Files. This memo provides information for the Internet community.},
}