1. X3D International Standard. (2004). X3D framework & SAI. ISO/IEC FDIS (Final Draft International Standard) 19775:200x. Retrieved from http://www.web3d.org/x3d/specifications/ISO-IEC-19775-IS- X3DAbstractSpecification/
2. Adamo-Villani, N., & Johnson, E. (2010, April 28-30). Virtual heritage applications: The 3D tour of MSHHD. In Proc. of ICCSIT 2010 - International Conference on Computer Science and Information Technology, Rome, Italy.
3. Adamo-Villani, N., Johnson, E., & Penrod, T. (2009, April 22-24). Virtual reality on the web: The 21st century project. In Proc. of m-ICTE 2009 -V Int. Conf. on Multimedia and Information and Communication Technologies in Education, Lisbon, Portugal (pp. 622-626).
4. Adobe Flash 3D graphics. (2010). Retrieved from http://help.adobe.com/en_US/Flash/10.0_UsingFlash/WS3D3F757E-6EEB-4f6b-BC7F-BE8F94D329E1.html
5. The Scientific Research Potential of Virtual Worlds