Leitner, Ulrike. ““My Dear, Lovely Gabriele!ʺ Alexander Von Humboldt’s Correspondence With His Niece Gabriele Von Bülow”. HiN - Alexander von Humboldt in the Net. International Review for Humboldt Studies 26, no. 50 (July 23, 2025): 113–133. Accessed July 10, 2026. https://hin-online.de/index.php/hin/article/view/386.