“Metode Montessori Berbantu Alat Peraga Matematika Berbahan Limbah Karet Spons untuk Mengembangkan Partisipasi Aktif Siswa SD: Montessori Method Assisted Math Tools Made from Rubber Sponge Waste for Developing Elementary Students Active Participation”, pedagogia, vol. 8, no. 1, pp. 85–94, Feb. 2019, doi: 10.21070/pedagogia.v8i1.1794.