%% You should probably cite rfc3187 instead of this I-D.
@techreport{hakala-isbn-01,
    number =    {draft-hakala-isbn-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-hakala-isbn/01/},
    author =    {Hartmut Walravens and Juna Hakala},
    title =     {{Using International Standard Book Numbers as Uniform Resource Names}},
    pagetotal = 11,
    year =      2001,
    month =     jan,
    day =       25,
    abstract =  {This document discusses how International Standard Book Numbers (ISBN) can be supported within the URN (Uniform Resource Names) framework and the syntax for URNs defined in RFC 2141. Much of the discussion below is based on the ideas expressed in RFC 2288. This memo provides information for the Internet community.},
}