Guszkowska, M., Kuk, A., Zagórska, A., & Skwarek, K. (2016). Self-esteem of physical education students: sex differences and relationships with intelligence. Current Issues in Personality Psychology, 4(1), 50–57. Pobrano z https://czasopisma.bg.ug.edu.pl/index.php/CIiPP/article/view/12176