Engagement photo of crown prince Gustaf and princess Victoria 1881 in Karlsruhe
Schultz &amp; Suck, Karlsruhe
Göran Alm &amp; Björn Axel Johansson. "Resan till Egypten. Drottning Victorias fotografiska liv." Stockholm: Atlantis 2012. <a href="//commons.wikimedia.org/wiki/Special:BookSources/978-91-7353-570-0" title="Special:BookSources/978-91-7353-570-0">ISBN 978-91-7353-570-0</a>. Source for 2017-06-21 version is <a rel="nofollow" class="external text" href="https://digitaltmuseum.se/011013839857/kabinettsportratt-av-gustav-v-och-viktoria?i=651&amp;aq=">Nordiska museet</a>.