%% You should probably cite rfc6474 instead of this I-D.
@techreport{ietf-vcarddav-birth-death-extensions-02,
    number =    {draft-ietf-vcarddav-birth-death-extensions-02},
    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-birth-death-extensions/02/},
    author =    {Kepeng Li and Barry Leiba},
    title =     {{vCard Format Extensions: Place of Birth, Place and Date of Death}},
    pagetotal = 6,
    year =      2011,
    month =     nov,
    day =       23,
    abstract =  {The base vCard 4.0 specification defines a large number of properties, including date of birth. This specification adds three new properties to vCard 4.0: place of birth, place of death, and date of death. {[}STANDARDS-TRACK{]}},
}