%% You should probably cite rfc3382 instead of this I-D.
@techreport{ietf-ipp-collection-04,
    number =    {draft-ietf-ipp-collection-04},
    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-ipp-collection/04/},
    author =    {Robert G. Herriot and Kirk Ocke and Peter Zehler and Thomas N. Hastings and Roger deBry},
    title =     {{Internet Printing Protocol (IPP): The 'collection' attribute syntax}},
    pagetotal = 38,
    year =      2001,
    month =     jan,
    day =       29,
    abstract =  {This document specifies an OPTIONAL attribute syntax called 'collection' for use with the Internet Printing Protocol/1.0 (IPP) {[}RFC2565, RFC2566{]}, IPP/1.1 {[}RFC2911, RFC2910{]}. A 'collection' is a container holding one or more named values, which are called 'member' attributes.},
}