Thank you for your help! I have edited my post with additional information. My audience is a general youth audience, think of promoting content to an entire high school, with "average teenagers" and people that might be more interested in content. Of course, some people will be more interested than others, so a wide variety of recommendations for different interest groups is better. I'm primarily looking for books that promote ethical/altruistic behavior, I'm not sure if any of your beforementioned recommendations do so.