AL HARBI, Abdullah bin Maatak bin Musleh. Educational problems facing teachers of natural sciences in the course system for the secondary stage in Qassim. Journal of Educational and Psychological Sciences, New Mexico, United States, v. 1, n. 9, p. 68–43, 2017. DOI: 10.26389/AJSRP.A120917. Disponível em: https://journals.ajsrp.com/index.php/jeps/article/view/148. Acesso em: 24 jan. 2026.