Seal of <a href="https://en.wikipedia.org/wiki/Birger_Brosa" class="extiw" title="en:Birger Brosa">Birger Brosa</a>
Nordisk familjebok (1905), band 3, sida 443 <a rel="nofollow" class="external autonumber" href="http://runeberg.org/nfbc/0256.html">[1]</a>