%% You should probably cite draft-ietf-vcarddav-vcardrev instead of this I-D.
@techreport{resnick-vcarddav-vcardrev-01,
    number =    {draft-resnick-vcarddav-vcardrev-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-resnick-vcarddav-vcardrev/01/},
    author =    {Pete Resnick and Simon Perreault},
    title =     {{vCard Format Specification}},
    pagetotal = 51,
    year =      2008,
    month =     feb,
    day =       7,
    abstract =  {This document defines the vCard data format for representing and exchanging a variety of information about an individual (e.g., formatted and structured name and delivery addresses, email address, multiple telephone numbers, photograph, logo, audio clips, etc.).},
}