Syofyan, H., and H. Fitra. “The Effect of Capital Structure, Sales Growth, Cash Turnover, and Firm Size on Profitability Mediated by Operational Effiency: Evidance from Healthcare Industry Listed on IDX”. Jurnal Informatika Ekonomi Bisnis, Vol. 7, no. 4, Oct. 2025, pp. 802-10, doi:10.37034/infeb.v7i4.1290.