Panunggal, Aji, et al. “Program Evaluation of Football Development in Gagak Muda Football School ”. Gladi : Jurnal Ilmu Keolahragaan, vol. 14, no. 01, Mar. 2023, pp. 104-20, https://journal.unj.ac.id/unj/index.php/gjik/article/view/27133.