1. Denise Schmandt-Besserat: Tokens: the cognitive significance. 6th Neolithic Seminar, Ljubljana, Slovenia. Documenta Praehistorica, vol. XXVI. (1999)
2. Fritz, Jason P., and Kenneth E. Barner. Design of a haptic data visualization system for people with visual impairments. Rehabilitation Engineering, IEEE Transactions on 7.3 (1999): 372–384
3. Iliinsky, N., Steele, J.: Designing Data Visualizations: Representing Informational Relationships. O’Reilly Media, Sebastopol (2011)
4. Ishii, H.: Tangible bits: beyond pixels. In: Proceedings of the 2nd International Conference on Tangible and Embedded Interaction. ACM, Bonn, Germany (2008)
5. O’Malley, C., Fraser, S.: Literature review in learning with tangible technologies. Technical Report, Futurelab (2004)