%% You should probably cite draft-cal-resource-vcard-03 instead of this revision.
@techreport{cal-resource-vcard-01,
    number =    {draft-cal-resource-vcard-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-cal-resource-vcard/01/},
    author =    {Ciny Joy and Cyrus Daboo and Mike Douglass},
    title =     {{vCard representation of resources for calendaring and scheduling services}},
    pagetotal = 22,
    year =      2012,
    month =     oct,
    day =       18,
    abstract =  {This specification describes the vCard representation of resources for calendaring and scheduling. A resource in the scheduling context is any shared entity that can be scheduled by a calendar user, but does not control its own attendance status.},
}