%% You should probably cite rfc6121 instead of this I-D.
@techreport{ietf-xmpp-3921bis-20,
    number =    {draft-ietf-xmpp-3921bis-20},
    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-xmpp-3921bis/20/},
    author =    {Peter Saint-Andre},
    title =     {{Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence}},
    pagetotal = 114,
    year =      2011,
    month =     jan,
    day =       20,
    abstract =  {This document defines extensions to core features of the Extensible Messaging and Presence Protocol (XMPP) that provide basic instant messaging (IM) and presence functionality in conformance with the requirements in RFC 2779. This document obsoletes RFC 3921. {[}STANDARDS-TRACK{]}},
}