%% You should probably cite draft-ietf-cbor-file-magic instead of this I-D.
@techreport{bormann-cbor-tag-coap-content-format-00,
    number =    {draft-bormann-cbor-tag-coap-content-format-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-bormann-cbor-tag-coap-content-format/00/},
    author =    {Carsten Bormann},
    title =     {{CBOR Tags for CoAP Content Formats}},
    pagetotal = 4,
    year =      2021,
    month =     jun,
    day =       2,
    abstract =  {This document describes a set of CBOR Tags that encode CoAP Content- Formats (RFC 7252).},
}