/lit/ - Literature

I want to learn more about socialist and modern capitalist theory(modern from what I know capitalism has changed so much since Adam Smith that it would be irrational to apply it today while socialism has remained largely the same with some offshoots). The problem I have with books I have read on them especially socialism is that they read like propaganda as opposed to an objective telling of the theory behind these idea and their shortcomings, so what recommendations does /lit/ have for books on these theories that read more textbooks/tomes as opposed to propaganda books?

P.S. I know every book will have some bias but I want one that has as little as possible.