“Improving learning outcomes in slagball material through the project-based learning model in grade IV at SD Negeri Gondang II Bojonegoro” (2024) NUSANTARA SPORTA: Jurnal Pendidikan dan Ilmu Keolahragaan, 2(04), pp. 359–373. doi:10.2024/ns.v3i04.2025_P559-568.