%% You should probably cite draft-ietf-mile-enum-reference-format instead of this I-D.
@techreport{montville-mile-enum-reference-format-02,
    number =    {draft-montville-mile-enum-reference-format-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-montville-mile-enum-reference-format/02/},
    author =    {Adam W. Montville},
    title =     {{IODEF Enumeration Reference Format}},
    pagetotal = 7,
    year =      2012,
    month =     dec,
    day =       14,
    abstract =  {The Incident Object Description Exchange Format {[}IODEF{]} provides a Reference class used to reference external entities (such as enumeration identifiers). However, the method of external entity identification has been left unstructured. This document describes a method to provide structure for referencing external entities for the {[}IODEF{]} Reference class.},
}