Wulf Otte, Weiß und Schwarz – Black and White: Photos aus Deutsch-Südwestafrika / from Namibia, 1896-1901, Wendeburg, Krebs, 2007. Journal of Namibian Studies : History Politics Culture, [S. l.], v. 5, p. 135–137, 2014. DOI: 10.59670/jns.v5i.24. Disponível em: https://namibian-studies.com/index.php/JNS/article/view/24. Acesso em: 1 nov. 2025.