Deng, Y., Y. Hwang, T. Layne, and S. Yli-Piipari. “Parents Shape Their Children’s Physical Activity During Unstructured Recess Through Intrinsic Value the Children Possess”. International Journal of Physical Education, Fitness and Sports, vol. 10, no. 3, Sept. 2021, pp. 103-1, doi:10.34256/ijpefs21311.