%% You should probably cite rfc6352 instead of this I-D.
@techreport{ietf-vcarddav-carddav-10,
    number =    {draft-ietf-vcarddav-carddav-10},
    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-vcarddav-carddav/10/},
    author =    {Cyrus Daboo},
    title =     {{CardDAV: vCard Extensions to Web Distributed Authoring and Versioning (WebDAV)}},
    pagetotal = 48,
    year =      2009,
    month =     nov,
    day =       9,
    abstract =  {This document defines extensions to the Web Distributed Authoring and Versioning (WebDAV) protocol to specify a standard way of accessing, managing, and sharing contact information based on the vCard format. {[}STANDARDS-TRACK{]}},
}