Viscount <a href="https://en.wikipedia.org/wiki/Hirata_Tosuke" class="extiw" title="w:Hirata Tosuke">Tōsuke Hirata</a>.
Unknown author<span style="display: none;">Unknown author</span>
Unknown date<div style="display: none;">Unknown date</div>
<i>Kazoku Gahō</i> (A Pictorial of Peerage), Kazoku Gahō Sha, 1913 (reprint, Yoshikawa Kōbunkan, 2011).