Spencer Ugochukwu, Nwakanma,. “Personal Service and Competitiveness of Oil and Gas Exploration and Producing Companies in the South-South Region of Nigeria”. GPH-International Journal of Business Management 8, no. 01 (January 16, 2025): 368-382. Accessed September 16, 2025. https://www.gphjournal.org/index.php/bm/article/view/1706.