MISHRA, C.K.; RAMAKRISHNA NAIDU, G.V. Ntfp Collection: a Case Study in Opportunity Costs. Indian Forester, [S. l.], v. 139, n. 1, p. 14–23, 2013. DOI: 10.36808/if/2013/v139i1/29127. Disponível em: http://indianforester.co.in/index.php/indianforester/article/view/29127. Acesso em: 4 dec. 2025.