Hi Jakub, Irving Howe’s “Essential Works of Socialism” was a big influence on me growing up. It is unfortunately out of print but used paperback copies are reasonably priced: https://www.amazon.com/Essential-Works-Socialism-Yale-paperbound/dp/0300019777/ref=sr_1_19?s=books&ie=UTF8&qid=1525559938&sr=1-19