%% You should probably cite draft-ietf-jcardcal-jcal instead of this I-D.
@techreport{kewisch-et-al-icalendar-in-json-02,
    number =    {draft-kewisch-et-al-icalendar-in-json-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-kewisch-et-al-icalendar-in-json/02/},
    author =    {Philipp Kewisch and Cyrus Daboo and Mike Douglass},
    title =     {{jCal: The JSON format for iCalendar}},
    pagetotal = 30,
    year =      2013,
    month =     mar,
    day =       18,
    abstract =  {This specification defines "jCal", a JSON format for iCalendar data.},
}