Azad, A. M. S., A. Raza, and S. S. Z. Zaidi. “Empirical Relationship Between Operational Efficiency and Profitability (Evidence from Pakistan Exploration Sector)”. Journal of Accounting, Business and Finance Research, vol. 2, no. 1, Feb. 2018, pp. 7-11, doi:10.20448/2002.21.7.11.