Faylori, Adelia Yusnita, et al. “Relationship Between Cholesterol Levels and Ca 15-3 Tumor Markers in Patients With Carcinoma Mammae”. Hydrogen: Jurnal Kependidikan Kimia, vol. 13, no. 5, Nov. 2025, pp. 956-64, doi:10.33394/hjkk.v13i5.17460.