“PROBLEM-BASED SITUATIONS, CASE STUDIES, PROJECT-BASED LEARNING, AND COLLABORATIVE TEACHING TECHNOLOGIES IN PRIMARY EDUCATION NATURAL SCIENCE LESSONS”, IJMR, vol. 1, no. 4, pp. 323–334, May 2026, Accessed: Oct. 22, 2026. [Online]. Available: http://researchiapress.com/index.php/1/article/view/298