%% You should probably cite rfc8633 instead of this I-D.
@techreport{ietf-ntp-bcp-08,
    number =    {draft-ietf-ntp-bcp-08},
    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-ntp-bcp/08/},
    author =    {Denis Reilly and Harlan Stenn and Dieter Sibold},
    title =     {{Network Time Protocol Best Current Practices}},
    pagetotal = 24,
    year =      2018,
    month =     nov,
    day =       12,
    abstract =  {The Network Time Protocol (NTP), currently on its fourth version, has been widely used since its initial publication. This documentation is a collection of Best Practices for general operation of time servers on the Internet from across the NTP community.},
}