WENIBOWEI, D. K. An Impact Assessment of the National Policy on Guidelines and Standards for Environmental Pollution Control in Nigeria, 1991: A Case Study of the Niger Delta. International Journal of Social Sciences and Humanities Invention, [S. l.], v. 5, n. 12, p. 5155–5162, 2018. DOI: 10.18535/ijsshi/v5i12.11. Disponível em: http://valleyinternational.net/index.php/theijsshi/article/view/1644. Acesso em: 5 may. 2024.