Ulil Albab, Irkham, et al. “Students’ Informal Strategy on Calculating the Volume of Three-Dimensional Shapes in STEM Learning Project: Design Bakpia Carton”. Metaverse: Journal of Mathematics Teacher Professional Development Research, vol. 1, no. 1, June 2025, pp. 12-21, https://journal.unesa.ac.id/index.php/metaverse/article/view/42961.