1. Ortega, P.: Juegos Educativos Para Ciegos: El Ahorcado. Final-year project, Facultad de Informática, Universidad Politécnica de Madrid (2004)
2. Sánchez, J., Lumbreras, M.: Ambientes Virtuales Interactivos para Niños Ciegos, Department of Computer Science, University of Chile (2002)
3. Sánchez, J., Sáenz, M.: 3D Sound Interactive Environments for Problem Solving, Department of Computer Science, University of Chile, ASSETS 2005 (2005)
4. Kurniawan, S.H., Sporka, A., Nemec, V., Slavik, P.: Design and User Evaluation of a Spatial Audio System for Blind Users, Department of Computation, UMIST, Department of Computer Science, Czech Technical University in Prague, 2004 ICDVRAT (2004)
5. Microsoft Corp, DirectX Tutorial (2005), http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/directx9_m/directx/directx9m.asp