Study on Habermas's theory of discourse democracy A study on Habermas's theory of discourse democracy Study on Marx's theory of social organism Study on elementary theory of red tourism Study on Lowenthal's theory of literature communication Study on Bakhtin's theory of body Study on the Yue theory of Song dynasty Study on the yue theory of Song dynasty Study on trotsky's theory of socialist revolution Study on Aquinas theory of transubstantiation