<a href="//commons.wikimedia.org/wiki/Category:Bernhard_Kellermann" title="Category:Bernhard Kellermann">Bernhard Kellermann</a>, 1914. Foto von Marta Wolff/Martha Wolff
<a href="//commons.wikimedia.org/wiki/Category:Marta_Wolff" title="Category:Marta Wolff">Marta Wolff</a> (1871-1941)
<a rel="nofollow" class="external text" href="http://www.tripota.uni-trier.de/single_picture.php?signatur=385_0829">Universum-Jahrbuch 1914. Leipzig: Reclam, 1914</a>