Reddit reviews IB Theory of Knowledge Course Book: Oxford IB Diploma Program Course Book

Critical Thinking: Theory of Knowledge; IB Course Textbook.

I've only read this one book specifically on the subject of critical thinking. Also, it was for coursework so I would have to re-read some of it before I could vouch for this as a good read or not. But it is written with the explicit intent to help HS students learn about what reasoning is and how to do it. So, it should be accessible and since you had no others listed, perhaps it can be an interim placeholder.