Švaříčková Slabáková, R. “Heinrich Coudenhove-Kalergi and Mitsuko Aoyama: Travels, Space and Time at the Turn of the 19th and 20th Centuries”. Theatrum Historiae, no. 12, June 2013, pp. 171-87, https://theatrum.upce.cz/index.php/theatrum/article/view/1945.