Debunking homeopathy - Best book or best article?

My wife is a teacher and she’s looking for good scientific material analyzing homeopathy. We both know that homeopathy’s effectiveness for some medical problems relies on the placebo effect. For other medical problems it has been found to be totally ineffective. And dangerous if it was the only treatment a patient received.

I never searched for books on the issue before and tried this today using all kinds of keywords like debunking, criticism, pseudoscience, illusion, and so forth. Both for German and English books. I couldn’t find a single one. Instead I always got thousands of hits with books praising homeopathy. Wow. So the best way might be to look for good articles, ideally written in a simple way that 11th graders can follow.

Any advice?