Puffin - ones I just read are:

8 Keys To Raising A Quirky Child (Bowers)
The Unwritten Rules of Friendship (Elman and Kennedy-Moore)
How To Make & Keep Friends: Tips for Kids To Overcome 50 Common Social Challenges (Briggs and Shea) for older kids, and there is a parent guide which I purchased by the same authors called How to Make & Keep Friends: Helping Your Child Achieve Social Success

If you don't have social skills, this will help both of you wink. I have excellent social skills but only because I was a social outcast so I read books like this to teach myself in middle school…I couldn't (or didn't care) about playing the game.. until I saw the consequences. I was so literal. I would say I don't understand what I did. And of course I would get "if you don't know I'm not going to tell you" So mature, right? I'm still very straight ahead in talking to people, but I also have to remind myself not to talk over people or interrupt when I get excited about a topic etc.