NUGRAHA, Y.; SUJADI, I.; PANGADI, P. Penalaran proporsional siswa kelas VII. Beta: Jurnal Tadris Matematika, [S. l.], v. 9, n. 1, p. 34–47, 2016. DOI: 10.20414/betajtm.v9i1.2. Disponível em: https://www.jurnalbeta.ac.id/index.php/betaJTM/article/view/2. Acesso em: 29 may. 2026.