Rafsanjani, Arief, et al. “Analisis Kaplan Meier Terhadap Perbaikan Klinis Batuk Pada Pasien Pneumonia Anak Yang Diberikan Terapi Tambahan Vitamin D: Kaplan Meier’s Analysis of Clinical Improvement of Cough in Child Pneumonia Patient’s That Given With Additional Vitamin D Therapy”. Jurnal Surya Medika (JSM), vol. 7, no. 1, Aug. 2021, pp. 83-87, https://doi.org/10.33084/jsm.v7i1.2632.