Ludvig Brandstrup (1861-1935), Kunsthistorikeren Karl Madsen, 1932
Statens Museum for Kunst
<a rel="nofollow" class="external free" href="https://www.europeana.eu/da/item/2020903/KMS5875">https://www.europeana.eu/da/item/2020903/KMS5875</a>