Rebok S, Winkle T. “Mason without apron” - Alexander von Humboldt and the world of freemasonry. Humboldt im Netz [Internet]. 6 agosto 2019 [citato 12 maggio 2026];20(38):31-50. Disponibile su: https://www.hin-online.de/index.php/hin/article/view/274