Safiah, I.; Yunus, M.; Zaki, A.; Ahadin; Hasniyati. Development of Ubiquitous Project-Based Learning (U-Pjbl) Model to Improve Critical Thinking Skills of Elementary School Students. JL4D 2025, 12 (2), 313-329. https://doi.org/10.56059/jl4d.v12i2.1358.