CROSS, Robert. Report on the Collecting of Seeds and Plants of the India-rubber Tree (Castilloa Elastica) in the Forests of the Esthmus of Darien. Indian Forester, [S. l.], v. 1, n. 4, p. 368–385, DOI: 10.36808/if/1876/v1i4/13020. Disponível em: http://indianforester.co.in/index.php/indianforester/article/view/13020. Acesso em: 4 dec. 2025.