Duda, Anna, and Ewa Klimek-Piskorz. 2024. “Assessment of Changes in the Physical Fitness and Capacity of Juniors Playing Football Non-Professionally in the 2022 23 Season”. Państwo I Społeczeństwo State and Society 24 (2):123-33. https://doi.org/10.48269/2451-0858-pis-2024-2-009.