Erfita Anasha Wiraida, and Sarah Handayani. “The Effect of Caffeine on VO2max in Adolescent Athletes”. I-Core: International Journal of Sport Science, vol. 1, no. 2, Oct. 2025, pp. 53-60, https://www.journals.stokbinaguna.ac.id/index.php/i-core/article/view/5888.