Fatiya, Hayati N. The Effectiveness of Project-Based Learning on Early Childhood Problem-Solving Skills: An Experimental Study. Int. J. educ. Teach. Zone [Internet]. 2025 Jun. 16 [cited 2025 Oct. 18];4(2):208-22. Available from: https://jurnal.yayasannurulyakin.sch.id/index.php/ijetz/article/view/397