Can anyone recommend any books I could give my teenage son to help him understand what being on the spectrum means and to help him see if he relates to it and thinks the criteria fits him so he can self diagnose? Thanks.

I ordered my teen daughter a book to help her understand but there is now an updated one of the same book which I haven't yet tried but I hope it helps. I ordered it from Amazon but it won't let me copy the link for some reason. 

Survival Guide for Kids with Autism Spectrum Disorders