%% You should probably cite rfc8472 instead of this I-D.
@techreport{ietf-tokbind-negotiation-14,
    number =    {draft-ietf-tokbind-negotiation-14},
    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-tokbind-negotiation/14/},
    author =    {Andrei Popov and Magnus Nyström and Dirk Balfanz and Adam Langley},
    title =     {{Transport Layer Security (TLS) Extension for Token Binding Protocol Negotiation}},
    pagetotal = 8,
    year =      2018,
    month =     may,
    day =       23,
    abstract =  {This document specifies a Transport Layer Security (TLS) extension for the negotiation of Token Binding protocol version and key parameters. Negotiation of Token Binding in TLS 1.3 and later versions is beyond the scope of this document.},
}