https://www.serkantoto.com/2012/05/09/kompu-gacha-dena-gree-history/
https://www.serkantoto.com/2012/03/24/japan-social-game-makers-self-regulation-council/
https://www.theverge.com/2017/11/16/16668234/battlefront-2-loot-boxes-crystal-microtransactions-removed-ea
https://cs-agents.com/blog/history-loot-box-gacha/
https://digitalcommons.law.msu.edu/cgi/viewcontent.cgi?article=1266&context=ilr
https://medium.com/@john_23522/the-history-of-gacha-in-video-games-2f5640a3160d
https://www.wired.com/2012/05/japanese-mobile-games-gree-dena/
https://onlinelibrary.wiley.com/doi/full/10.1111/add.14286
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