%% You should probably cite draft-ietf-calext-jscontact-vcard instead of this I-D.
@techreport{ietf-jmap-jscontact-vcard-06,
    number =    {draft-ietf-jmap-jscontact-vcard-06},
    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-jmap-jscontact-vcard/06/},
    author =    {Mario Loffredo and Robert Stepanek},
    title =     {{JSContact: Converting from and to vCard}},
    pagetotal = 42,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {This document defines how to convert contact information as defined in the JSContact {[}draft-ietf-jmap-jscontact{]} specification from and to vCard.},
}