%% You should probably cite draft-ietf-tls-tls13-cert-with-extern-psk instead of this I-D.
@techreport{housley-tls-tls13-cert-with-extern-psk-03,
    number =    {draft-housley-tls-tls13-cert-with-extern-psk-03},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-housley-tls-tls13-cert-with-extern-psk/03/},
    author =    {Russ Housley},
    title =     {{TLS 1.3 Extension for Certificate-based Authentication with an External Pre-Shared Key}},
    pagetotal = 10,
    year =      2018,
    month =     nov,
    day =       8,
    abstract =  {This document specifies a TLS 1.3 extension that allows a server to authenticate with a combination of a certificate and an external pre- shared key (PSK).},
}