My favorite books:

Marx & Engels: "Das Kapital", "Manifest der Kommunistischen Partei", "Der Bürgerkrieg in Frankreich", "Dialektik der Natur", "Herr Eugen Dühring und die Umwälzung der Wissenschaft", "Die deutsche Ideologie".
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Rosa Luxemburg: "Zur Russischen Revolution".
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Vladimir I. Lenin: "The State and Revolution", "Imperialism: The Highest Stage of Capitalism", "On the Road", "Left-Wing Communism: An Infantile Disorder", "What is to be Done?", "Materialism and Empirio-Criticism".
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Leon Trotsky: "Stalin", "My Life", "The Permanent Revolution", "Stalinism and Bolshevism", "The Revolution Betrayed", "The Third International After Lenin", "The History of the Russian Revolution".
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Georgi V. Plekhanov: "The Materialist Conception of History".
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Yevgeni Preobrazhensky: "The New Economics".
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August Thalheimer: "Über den Faschismus".
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Alan Woods & Ted Grant: "Reason in Revolt: Marxism and Modern Science", "Lenin and Trotsky: What they really stood for".
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Edward H. Carr: "Socialism in one Country", "The Russian Revolution: From Lenin to Stalin (1917-1929)".
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Isaac Deutscher: "Stalin: A Political Biography", "The Unfinished Revolution: Russia 1917-1967".
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Ulf Wolter: "Grundlagen des Stalinismus".
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Pierre Broué: "Die Deutsche Revolution (1918 - 1923)".
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Louis Althusser: "Das Kapital lesen".
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Vadim Z. Rogovin: "Was there an alternative to Stalinism in the USSR?".
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David North: "Perestroika versus Socialism: Stalinism and the Restoration of Capitalism in the USSR", "Marxism, History & Socialist Consciousness".
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Boris Souvarine: "Stalin: A Critical Survery of Bolshevism".
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Richard Dawkins: "The God Delusion".
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Michail A. Sholokhov: "The Silent Don".
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Maxim Gorky: "Mother".
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Nikolai Chernyshevsky: "What is to be Done?".
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Nazim Hikmet Ran: "Şeyh Bedrettin Destanı".
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Victor Hugo: "Les Misérables", "Les travailleurs de la mer", "Claude Gueux", "Napoleon le Petit".