The Communist Manifesto
A classic every communist must read. The Communist Manifesto, written by Karl Marx and Friedrich Engels in 1848, outlines the basic principles of communism, including the concept of class struggle.
Reform or Revolution
Reform or Revolution by Rosa Luxemburg explores the flaws of Bernstein's theory of a reformist Social-Democracy in the context of achieving the ultimate goal of socialism.
The Conquest of Bread
The Conquest of Bread, written by Peter Kropotkin, argues for an anarchist society based on mutual aid and collective ownership, critiquing capitalism and advocating for a system that meets the needs of all people. I would recommend thi book because of its depthening of communisation theory and understanding of mutual aid.