Capital by Karl MarxCapital in Manga by Variety ArtworksCapital Illustrated by David SmithReform or Revolution by Rosa LuxemburgWorkers’ Councils by Anton PannekoekWhy Marx Was Right by Terry EagletonOurs to Master and to Own by Immanuel Ness and Dario AzzelliniSubterranean Fire by Sharon SmithFour Futures by Peter FraseCaliban and the Witch by Silvia FedericiRed Rosa by Kate EvansDemocracy at Work by Richard WolffA People’s History of the United States by Howard Zinn Lies My Teacher Told Me by James LoewenSocialism…Seriously by Danny KatchThe Reactionary Mind by Corey RobinParecon by Michael AlbertSeventeen Contradictions and the End of Capitalism by David HarveyThese have probably informed my own ideas the most, so I highly recommend them. I apologize for not being able to provide links to these at the moment. Capital is free online, as are Reform or Revolution, Workers’ Councils, and A People’s History. Hope this can be a helpful reading list for you!