Asim Ameer Fadhil and Ukla Sulaiman Al-houry 2021. The effectiveness of a psychological-sports program to reduce aggression, anger and stubbornness among primary school students. Modern Sport. 20, 1 (Mar. 2021), 0143–0157. DOI:https://doi.org/10.54702/msj.2021.20.1.0143.