%% You should probably cite rfc8144 instead of this I-D.
@techreport{murchison-webdav-prefer-12,
    number =    {draft-murchison-webdav-prefer-12},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-murchison-webdav-prefer/12/},
    author =    {Kenneth Murchison},
    title =     {{Use of the Prefer Header Field in Web Distributed Authoring and Versioning (WebDAV)}},
    pagetotal = 36,
    year =      2016,
    month =     dec,
    day =       22,
    abstract =  {This document defines an update to the HTTP Prefer header field {[}RFC7240{]} to specify how it can be used by a WebDAV client to request that certain behaviors be employed by a server while constructing a response to a request. This document defines the "depth-noroot" preference.},
}