Nikmah, Atika, Setyo Sri Rahardjo, and Isna Qadrijati. 2018. “Indoor Smoke Exposure and Other Risk Factors of Pneumonia Among Children Under Five in Karanganyar, Central Java”. Journal of Epidemiology and Public Health 3 (1):25-40. https://www.jepublichealth.com/index.php/jepublichealth/article/view/61.