Two books have really affected me. The first was All Quiet on the Western Front. It seems like in history class, you're taught that the Germans were the bad guys, but in reality, your average German soldier was not much different to a British/American/French one, and they had it really hard towards the end of the war.
The second one was Ender's Game. It was so sad at the end *spoiler*, since the whole 3rd Bugger War was a misunderstanding. Even so, I kind of sympathised with Ender, even though he was a 6-year-old murderer. If you don't totally defeat the enemy while you can, you will fight the same battle over and over again.
I read both of those books when I was about 12, and they definitely had an impact on the way I thought and influenced my development.
One Ordinary Day, with Peanuts by Shirley Jackson. I find it influencing my behavior every day. This story follows a seemingly middle-aged man around town for one day, as he does one good deed after another for random people he meets. Not until the end do we find out why he does it. That ending made me think for a very long time, and I decided to adopt part of his lifestyle as my own...at least as much as I could.
You might also want to add one other story that affected me for years: And My Fear is Great by Theodore Sturgeon. To this day, I still quote a scene involving a coffee table; it offers a useful metaphor for my worldview...
I don't think that study really shows a story changing people. It shows that people come in with varying degrees of empathy for others. Those with a higher degree react more to the story and donate more to others. But there is no causal link should between the story and the donation that I can see. Only between being an empathic person and both outcomes.