Fathurahman, Muhamad Farhan, et al. “The Influence of Literacy and Numeracy Learning in IPS Subjects on students’ 21st-Century Skills”. Harmoni Sosial: Jurnal Pendidikan IPS, vol. 10, no. 1, Mar. 2023, pp. 90-96, doi:10.21831/hsjpi.v10i1.59192.