1. Oculus Rift. Retrieved May 24 2016 from https://www.oculus.com/en-us/rift/ Oculus Rift. Retrieved May 24 2016 from https://www.oculus.com/en-us/rift/
2. Kinect for Windows. Retrieved May 24 2016 from http://www.microsoft.com/en-us/kinectforwindows Kinect for Windows. Retrieved May 24 2016 from http://www.microsoft.com/en-us/kinectforwindows
3. Leap Motion. Retrieved May 24 2016 from http://www.leapmotion.com Leap Motion. Retrieved May 24 2016 from http://www.leapmotion.com
4. Grigore C. Burdea Philippe Coiffet. 2003. Virtual reality technology (Vol. 1). John Wiley & Sons. Grigore C. Burdea Philippe Coiffet. 2003. Virtual reality technology (Vol. 1). John Wiley & Sons.