Abdullah Adnan Muhammad. The effect of using vertical learning effect transmission on learning some skills in tennis for middle-generation students for boys. Mustansiriyah J. Sports Sc. [Internet]. 2024 Feb. 12 [cited 2024 Jul. 3];3(2):153-9. Available from: https://mjss.uomustansiriyah.edu.iq/index.php/mjss/article/view/589