Ertiana, D., & Utami, S. (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), 115–124. https://doi.org/10.32922/jkp.v10i2.459