Muhammad Algipari, and Nugroho Susanto. “The Contribution of Mental Toughness to Competitive Anxiety in U-15 SSB Tunas Inti at Sungai Penuh City Football Athletes ”. JOURNAL RESPECS (Research Physical Education and Sports), vol. 5, no. 2, July 2023, pp. 278-83, doi:10.31949/respecs.v5i2.5709.