TKP-ML Central Committee: We Remember Those Who Became Immortal in the Struggle for Revolution and Communism! https://www.tkpml.com/tkp-ml-central-committee-we-remember-those-who-became-immortal-in-the-struggle-for-revolution-and-communism/
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Marx & Engels: Chapter Four of German Ideology https://marxistleninists.org/M&E/1845/german-ideology/ch04.htm