A study on Karl Kautsky's early socialist thought A study on Sallust's historical thought A study on trotsky's theory of socialist revolution A study of Marx's democratic thought A study of Saussure's linguistic thought A study on Fukuzawa Yukichi's thought A study on Song Tao's economic thoughts A study on Ellen Meiksins Wood's historical materialism thought A history of socialist thought A study on Zhang Xunhua's economic thoughts