R. Rahayu, M. Masfiyah, D. Intisari, I. H. Putri, and M. A. Hibatullah, “Validation of sputum gram stain and culture for diagnosis of pneumonia in critically iii patient: a retrospective observational study”, Sains Med J Ked Kes, vol. 14, no. 2, pp. 44–51, Dec. 2023, doi: 10.30659/sainsmed.v14i2.32809.