BUTTERWICK, A. J. S. The Road Drag. Indian Forester, [S. l.], v. 42, n. 11-12, p. 538–545, DOI: 10.36808/if/1916/v42i11-12/18073. Disponível em: https://indianforester.co.in/index.php/indianforester/article/view/18073. Acesso em: 21 aug. 2025.