%% You should probably cite rfc5071 instead of this I-D.
@techreport{ietf-dhc-pxelinux-03,
    number =    {draft-ietf-dhc-pxelinux-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-ietf-dhc-pxelinux/03/},
    author =    {David Hankins},
    title =     {{Dynamic Host Configuration Protocol Options Used by PXELINUX}},
    pagetotal = 14,
    year =      2007,
    month =     sep,
    day =       28,
    abstract =  {This document describes the use by PXELINUX of some DHCP Option Codes numbering from 208-211. This memo provides information for the Internet community.},
}