Fukuda, Kentaro. “A Fundamental Research on Issues of Baseball-Type Physical Education Classes in Japan: Through a Review of Practice-Based Research”. Sustainability and Sports Science Journal 4, no. 1 (October 7, 2025): 14–24. Accessed October 15, 2025. https://sssj.kineticeditorial.com/index.php/sssj/article/view/fundamental-research-issues-baseball-type-pe-classes-japan.