%% You should probably cite rfc8737 instead of this I-D.
@techreport{ietf-acme-tls-alpn-06,
    number =    {draft-ietf-acme-tls-alpn-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-acme-tls-alpn/06/},
    author =    {Roland Bracewell Shoemaker},
    title =     {{ACME TLS ALPN Challenge Extension}},
    pagetotal = 9,
    year =      2019,
    month =     sep,
    day =       6,
    abstract =  {This document specifies a new challenge for the Automated Certificate Management Environment (ACME) protocol which allows for domain control validation using TLS.},
}