Kusbaryanto -. The Correlation of Education about Cough Etiquette and the Knowledge of Security Officers and Cleaning Service Officers. Int. J. Hum. Health Sci. [Internet]. 2018 Nov. 2 [cited 2025 Nov. 5];3(1):23-5. Available from: https://ijhhsfimaweb.info/IJHHS/article/view/69