Citable Sources on Videogame Interactivity & Player Agency Needed

Seeking sources on videogames unique medium-specific features Hi, I’m writing on what makes videogames a unique medium in comparison to others, with a focus on the idea that interactivity, player choice and exploration virtual worlds are medium-specific features that shape experiences only possible in games. I need recent sources I can cite directly to support this ideally ones that explicitly discuss interactivity/player agency as a defining feature of videogames. I’d prefer articles or short studies rather than entire books, but be free to comment them if you think they might help, since I’m looking for sources that make the point clearly and concisely. If anyone can help thanks in advance!