Someone who is a medical professional (I am not) can chime in on whether this would be good, bad, or neither to watch for your purposes: the TV show called In Treatment. It's on Amazon Prime and probably some other services. It's dramatic of course, but I found it to be the most similar to what I've experienced in therapy.
I read Feeling Good back in middle school (that was I guess the early 90s). I can't really remember it well (though I do remember the principles of cognitive therapy). Then later read How To Stubbornly Refuse to Make Yourself Miserable About Anything, Yes, Anything by Albert Ellis. I guess I went for whatever my library had. Albert Ellis' ideas were not called CBT, but it was similar. He was a bit more extreme. I remember he said no situation was hopeless because even if (and I can't remember what . . . but it was the worst of the worst pain or something), you could always commit suicide thus proving there is always a solution. Was a bit startling to read. He also wrote against homosexuality which was not helpful at the time. That book was definitely more memorable, maybe not for great reasons. Oh, he also referred to "should" or "must" thinking as musturbation. That was amusing at the time.
Edit: Dear God, I just looked him up and Albert Ellis is still alive. I felt like I was reading the works of a relic in the 1990s. Interesting.
Edit 2: If you want a more sanitized peek into therapy in the form of a television show, The Bob Newhart Show is pretty good IMO. His group therapy sessions are actually not *that* far off from things I've experienced. They have a bit of the encounter group vibe as well, and I'm not sure that's used much anymore (see the series finale of Mad Men for a good depiction of an encounter group).