Tzetzis Γ, Goudas Μ, Kyratsou Ε. A Comparison of Physical Activity Levels, Goal Orientations and Perceived Competence in 5th and 6th Grade Elementary School Students at Physical Education Classes . ispe [Internet]. 2005 Feb. 3 [cited 2024 Nov. 21];3(1):1-12. Available from: https://journals.lib.uth.gr/index.php/inquiries/article/view/1064