FIRLY AJURNI; NOVILIA WULAN SARI; SUMRIYAH SUMRIYAH. SURAT BERHARGA CEK. JURNAL PENDIDIKAN DAN ILMU SOSIAL (JUPENDIS), [S. l.], v. 1, n. 3, p. 99–106, 2023. DOI: 10.54066/jupendis-itb.v1i3.240. Disponível em: https://jurnal.itbsemarang.ac.id/index.php/JUPENDIS/article/view/240. Acesso em: 22 dec. 2024.