COLLINGWOOD, Harris. A Plea for Professional Courage. Indian Forester, [S. l.], v. 69, n. 4, p. 187–191, 1943. DOI: 10.36808/if/1943/v69i4/22090. Disponível em: https://indianforester.co.in/index.php/indianforester/article/view/22090. Acesso em: 21 aug. 2025.