Purnamasari, I. et al. 2023. The effectiveness of giving Android-based applications as promotional media in improving COVID-19 preventive behavior in the community. Qanun Medika - Medical Journal Faculty of Medicine Muhammadiyah Surabaya. 7, 2 (Jul. 2023). DOI:https://doi.org/10.30651/jqm.v7i2.12829.