1. Abrami, P. 2001. Improving judgements about teaching effectiveness using teacher rating forms. New Directions for Instutional Research, 109(1), 59-87.
2. Bellinio, J. (2012). Multi-Sensory Manipulatives in Mathematics: Linking the Abstract to the Concrete. Yale-New Haven Teachers Institute.
3. Boggan, M., Harper, S, & Whitmire, A. (2010). Using manipulatives to teach elementary mathematics. Journal of Instructional Pedagogies, 3(1), 1-6.
4. Bozkurt, A., &Akalın, S. (2010). Matematik öğretiminde materyal geliştirmenin ve kullanımının yeri, önemi ve bu konuda öğretmenin rolü [The place and importance of material development and usage in mathematics teaching and the role of teacher in this subject]. Dumlupınar University The Journal of Education Faculty, 27(1), 556-558.
5. Cope, L. (2015). Math manipulatives: Making the abstract tangible. Delta Journal of Education, 5(1), 10-19.