Ahdhianto, E.; Masula, S.; Thohir, M. A.; Khotimah, K. Development of PBL-Based E-Modules to Improve Problem-Solving and Critical Thinking Skills of Elementary School Students. J. Math Educ. Nusant. Wahana Publ. Karya Tulis Ilm. di Bid. Pendidik. Mat. 2024, 10, 167-178.