1. Department of Mathematics Education, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia, Bandung, INDONESIA
2. Indonesian DDR Development Center (PUSBANGDDRINDO), PUI-PT Universitas Pendidikan Indonesia, Bandung, INDONESIA
3. Department of Mathematics Education, Universitas Pancasakti Tegal, Tegal, INDONESIA
4. Universitas Islam Ogan Komering Ilir Kayuagung, Kayuagung, INDONESIA
5. Department of Mathematics Education, Faculty of Mathematics and Natural Science, Yogyakarta State University, Yogyakarta, INDONESIA