Rahayu, R. et al. 2023. Validation of sputum gram stain and culture for diagnosis of pneumonia in critically iii patient: a retrospective observational study. Sains Medika: Jurnal Kedokteran dan Kesehatan. 14, 2 (Dec. 2023), 44–51. DOI:https://doi.org/10.30659/sainsmed.v14i2.32809.