ARTHUR, A. A., E. O. EMENYI, and S. A. OKPO. “ENVIRONMENTAL DEGRADATION COST AND FINANCIAL PERFORMANCE OF LISTED OIL AND GAS FIRMS IN NIGERIA”. GPH-International Journal of Applied Science, Vol. 8, no. 9, Nov. 2025, pp. 23-66, doi:10.5281/zenodo.17500441.