Ertiana, Dwi, and Sri Utami. 2022. “Mother’s Knowledge of Efforts to Prevent Covid 19 Transmission in Children Age 3 - 5 Years Old”. JURNAL KESEHATAN POLTEKKES KEMENKES RI PANGKALPINANG 10 (2):115-24. https://doi.org/10.32922/jkp.v10i2.459.