A. Yanda, A. D. Riskia, A. Gani, and Z. Zulfitri, “Correlation Between Left Ventricular Ejection Fraction and Anemia in Patients With Congestive Heart Failure in dr. Zainoel Abidin General Hospital Banda Aceh”, KOLONI, vol. 5, no. 2, pp. 693–701, Jun. 2026.