| 1 | Yuzawa, M., Bart W. M., Kinne L. J., Sukemune, S. & Kataoka, M. (1999). The effect of “Origami” practice on size comparison strategy among young Japanese and American children. Journal of Research in Childhood Education 13(2) pp.133-143. |
| 2 | Franco, B. (1999). Unfolding Mathematics With Unit Origami, , Emeryville CA: Key Curriculum Press. |
| 3 | Matroll, J. A Plethora of Polyhedra in Origami. Dover Publications Kawamura, M. Polyhedron Origami for Beginners |