DIENTA, Dienta Gustria Rani Darsono; PUTRI, Feronica Eka; RIANA, Nancy. Strengthening Logical Thinking in Children Aged 5-6 Years Through BUMIKA Geometry: A Classroom Action Research Study. Transformasi : Jurnal Penelitian dan Pengembangan Pendidikan Non Formal Informal, [S. l.], v. 12, n. 2, p. 1010–1018, 2026. DOI: 10.33394/jtni.v12i2.19141. Disponível em: https://e-journal.undikma.ac.id/index.php/transformasi/article/view/19141. Acesso em: 23 sep. 2026.