Stella, Marco, and Karel Kleisner. “Welt, Umwelt, Lebensraum: Uexküll, Lorenz and Gehlen - Dispute over Human World and Animal Worlds”. Lidé města 9, no. 2-3/21 (December 1, 2007): 7-26. Accessed July 3, 2024. https://ojs.cuni.cz/lidemesta/article/view/3750.