Giyanti, Lestari I, Oktaviyanthi R. Integration of item response theory in the development of PhET-based graphing lines worksheets for optimizing student algebra competence. J. Elemen [Internet]. 2025 Feb. 1 [cited 2025 Feb. 2];11(1):153-70. Available from: https://e-journal.hamzanwadi.ac.id/index.php/jel/article/view/27634