Deva Ayu Setyani and Suci Atiningsih 2026. The Role of Corporate Sustainability Report (CSR) in Mediating the Effect of Efficiency and Leverage Strategies on the Financial Performance of PT Wijaya Karya Tbk (Study: IDX-Indexed Infrastructure Companies for the 2020-2024 Period). International Journal of Economics, Business and Innovation Research. 5, 03 (May 2026), 3545-3564. DOI:https://doi.org/10.63922/ijebir.v5i03.3590.