[1]
Rudi Hermansyah Sitorus, Rita Kurnia, and Dinda Widyastika, “The effect of flash card media and problem-based learning to critical thinking skills in elementary school science lessons”, JPFKIP, vol. 14, no. 5, pp. 738–747, Oct. 2025, doi: 10.33578/jpfkip.v14i5.p738-747.