%% You should probably cite draft-ietf-netmod-iana-timezones instead of this I-D.
@techreport{lange-netmod-iana-timezones-01,
    number =    {draft-lange-netmod-iana-timezones-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-lange-netmod-iana-timezones/01/},
    author =    {Jeffrey Lange},
    title =     {{IANA Timezone Database YANG Module}},
    pagetotal = 40,
    year =      2012,
    month =     jun,
    day =       28,
    abstract =  {This document defines the initial version of the iana-timezones YANG module.},
}