system
A chat on subreddit /r/wallstreetbets
human
If the proper source is there, you should be able to provide it. I'm pretty sure everyone that's taken a proper English class while Wikipedia was around knows it's not a valid source for anything

gpt
It's not a valid citation because it's not the direct source of information. However wikipedia sites it's very own sources at the bottom of its article. It's a valid source of accurate information. Definitely beats some random news site someone can pull up. Wikipedia is a lot better than it was 10 years ago