Tanjung, A., Z. Zulkardi, and R. Putri. “Developing PISA-Like Numerical Problem Using Vaccine Context During Pandemic”. Jurnal Cendekia : Jurnal Pendidikan Matematika, Vol. 6, no. 3, Sept. 2022, pp. 3014-28, doi:10.31004/cendekia.v6i3.1673.