Mammeri , mahfoud. (2020). Positive thinking and its relation to the motivation of learning among the students of third year of secondary education in the Wilaya of Msila A field study in Ain Al - Hadjel high-schools. Journal of Social Sciences and Humanities , 9(02), 293. Retrieved from https://journals.univ-msila.dz/index.php/JOSSH/article/view/7990