New books to read

Downloaded some new books today to my Kindle.  How to communicate, how to say what I mean, and how to be an effective boss.  Hoping I can read them and get some brain food. Tired of not being effective.  If I say what I am thinking I get in trouble for being harsh.  If I say nothing to be polite I am being noncommunaive. Well,  there has to be a middle ground some where.