Joško Sindik, and Ana-Mary Bauer Čuk. 2025. “PSYCHOLOGICAL CHARACTERISTICS AND TRAITS IN MALE HANDBALL PLAYERS – OPTIMISM, ATHLETE ENGAGEMENT AND MENTAL ENERGY”. Sport Scientific And Practical Aspects 13 (1). Bosnia and Herzegovina. http://www.sportspa.ftos.untz.ba/index.php/sportspa/article/view/144.