TROLL, C. Die Geographentagung in Bonn. ERDKUNDE, [S. l.], v. 1, n. 2, p. 206–208, 1947. DOI: 10.3112/erdkunde.1947.02.10. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/857. Acesso em: 2 mar. 2025.