1. Armstrong, M. (2018). The Companies Making the Most from Video Games. Available at: https://www.statista.com/chart/8870/tencent-is-top-of-the-game-revenues-leaderboard/ (01.08.2018).;
2. Batchelor James (2018) GTA V is the most profitable entertainment product of all time. Games Industry Biz. Available at: https://www.gamesindustry.biz/articles/2018-04-09-gtav-is-the-most-profitable-entertainment-product-of-all-time (05.08.2018).;
3. Big Fish, 2018. Mega-Million Dollar Games. Available at: https://www.bigfishgames.com/blog/stats/mega-million-dollar-games/ (07.07.2018).;
4. Bonardi, J.-P., Durand, R. (2003). 'Managing network effects in high-tech markets', The Academy of Management Executive, 17(4), 40-52.;
5. Cherney, M. (2018). This violent videogame has made more money than any movie ever. Available at: https://www.marketwatch.com/story/this-violent-videogame-has-made-moremoney-than-any-movie-ever-(05.06.2018).;