Sometimes you need to make a heavy topic more accessible. Take It as a Compliment uses the words of twenty abuse survivors combined with images that tell the story but are not explicit. It's a powerful graphic novel that will leave you outraged at the injustices.
Trauma is Really Strange by Steve Haines
Trauma Is Really Strange is short and informative. Not only will it help you understand what's going on with PTSD, but it also gives tips on recovering from everyday stress. These would both be good choices to leave lying around where young adults can find and read.