J. W. P. Purba, Y. S. N. Girsang, and N. Sinaga, “Financial Performance Analysis Using Liquidity, Solvency, Profitability and Activity Ratios at PT XL Axiata, Tbk”, JIA, vol. 8, no. 1, pp. 290 – 303, May 2026, doi: 10.36985/81rdsg71.