<a href="//commons.wikimedia.org/wiki/Gunnar_Heiberg" title="Gunnar Heiberg">Gunnar Heiberg</a> tegnet av <a href="//commons.wikimedia.org/wiki/Christian_Krohg" title="Christian Krohg">Christian Krohg</a>.
<bdi><a href="https://en.wikipedia.org/wiki/en:Christian_Krohg" class="extiw" title="w:en:Christian Krohg"><span title="Norwegian painter (1852-1925)">Christian Krohg</span></a>
</bdi>
Unknown date<div style="display: none;">Unknown date</div>
Scanned from Einar Skavlan: <i>Gunnar Heiberg</i>, p. 184. Oslo: Aschehoug, 1950.