These vary in explicitness: ‘what is to be done’ by chernyshevsky, ‘ecotopia’ by callenbach, ‘news from nowhere’ by morris, ‘utopia’ by more, and ‘parable of the sower’ by butler (this one is not about communism, but rather non-explicitly building socialism in a realistic dystopia. It’s a must read). The first four are utopian books because that is my current area of study.