Which Are Relationships Top Books?

I am interested in knowing more about how to have quality relationships and the best of marriage. I have a book on marriage, "marriage Is Evil: Don't Marry". It's published on amazon. It has received wide acceptance but it has also generated more intriguing questions about marriage and relationships. So I am considering writing a sequel. And to do that I am trying research more and digging deeper to know more. So, I need read good relationships books and collaborate with top relationships experts. Any suggestions?