Muliadi, M., A. Asio, and S. Sukarsih. “THE EFFECTIVENESS OF THE COMBINATION OF DEMONSTRATION METHODS AND VIDEOS HOW TO CRUSH THE DENTALS OF GRADE IV STUDENTS OHI-S IN 2019”. Jurnal Bahana Kesehatan Masyarakat (Bahana of Journal Public Health), Vol. 4, no. 2, Nov. 2020, pp. 80 -84, doi:https://doi.org/10.35910/jbkm.v4i2.252.