FORD ROBERTSON, F. C. Resin Tapping in Kumaon. Indian Forester, [S. l.], v. 65, n. 2, p. 89–104, 1939. DOI: 10.36808/if/1939/v65i2/27577. Disponível em: https://indianforester.co.in/index.php/indianforester/article/view/27577. Acesso em: 21 aug. 2025.