Arrofiu Wakufyatan (2026) “Implementasi Program Latihan Fartlek Untuk Meningkatkan VO2max Pada Pemain Sepak Bola PSHW Karangagung Usia 19 Tahun Pra Kompetisi Liga Askab Pssi Tuban 2026: Implementation of a Fartlek Training Program to Improve VO2max in 19-Year-Old PSHW Karangagung Soccer Players Prior to the 2026 Askab PSSI Tuban League Competition”, Indonesian Strength Conditioning and Coaching Journal, 4(1), pp. 154–164. Available at: https://ejournal.unesa.ac.id/index.php/isco/article/view/82289 (Accessed: 18 October 2026).