Fadilah, A. N., S. Sutirna, and H. Haerudin. “The Effect of Problem-Based Learning Model Assisted by Google Site on the students’ Mathematical Concept Understanding Ability”. Union: Jurnal Ilmiah Pendidikan Matematika, vol. 11, no. 2, July 2023, pp. 184-90, doi:10.30738/union.v11i2.13273.