On-the-job training of park rangers as a machinery for sustainable eco-tourism in Nigeria empirics of Cross River National Park. Multi-disciplinary Journal of Research and Development Perspectives, [S. l.], v. 12, n. 1, 2026. Disponível em: https://mjrdp-unical.org.ng/index.php/home/article/view/49. Acesso em: 15 may. 2026.