1. X3D – 〈http://www.web3d.org/x3d/specifications/〉.
2. VRML The Virtual Reality Modeling Language (VRML). ISO/IEC 14772-1, 1997.
3. COLLADA – 〈http://www.khronos.org/collada/〉.
4. ISO/IEC 14496-16:2006 JCT1/SC29/WG11, Part 16: Animation Framework eXtension (AFX) Amendment 1: Geometry and Shadow, ed, 2007.
5. Marius Preda (Ed.), ISO/IEC14496-16:2011, Animation Framework eXtension (AFX) 4th Edition, 〈www.iso.ch〉, Geneva, 2011.