1. Aarseth, E.J.: Cybertext: Perspectives on Ergodic Literature. Johns Hopkins University Press, Baltimore (1997)
2. Anon. Leap Motion Unveils World’s Most Accurate 3-D Motion Control Technology for Computing—Leap Motion (2012).
https://www.leapmotion.com/news/leap-motion-unveils-worlds-most-accurate-3-d-motion-control-technology-for-computing
. Accessed 29 May 2018
3. Anon. Time Carnage - More than Just Another Wave Shooter|VR Game Rankings: Reviews - Previews - Lists, VR Game Rankings (2018).
https://www.vrgamerankings.com/single-post/2018/04/18/Time-Carnage—More-than-just-another-wave-shooter
. Accessed 31 May 2018
4. Bagwell, T.: Awaken Online. Book 1 : Catharsis (2016)
5. Bartle, R.: Hearts, clubs, diamonds, spades: players who suit MUDs. J. MUD Res. 1(1), 19 (1996)