MARCONI, M. Imperialism, Nationalism And Colonies In The Work Of Friedrich Ratzel. Bollettino della Società Geografica Italiana, [S. l.], p. 555–570, 2011. DOI: 10.36253/bsgi-7353. Disponível em: https://www.bsgi.it/index.php/bsgi/article/view/7353. Acesso em: 14 oct. 2026.