Manullang, Ade Surya, et al. “Peran Sosiologi Olahraga Terhadap Pelatih Sepakbola”. Jurnal Pendidikan Tambusai, vol. 8, no. 2, June 2024, pp. 22502-6, http://jptam.org/index.php/jptam/article/view/15533.