1. Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Perak, MALAYSIA
2. Pejabat Pendidikan Daerah Kerian, Parit Buntar, Perak, MALAYSIA
3. Faculty Educational Studies, Universiti Putra Malaysia, Selangor, MALAYSIA
4. Institut Penyelidikan Matematik, Universiti Putra Malaysia, Seri Kembangan, MALAYSIA