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Studying independently , he spent much time in Changsha 's library , reading core works of classical liberalism such as Adam Smith 's " The Wealth of Nations " and Montesquieu 's " The Spirit of the Laws " , as well as the works of western scientists and philosophers such as Darwin , Mill , Rousseau , and Spencer .
 Changsha, Adam Smith, Montesquieu, Darwin, Mill, Rousseau, Spencer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Changsha, Adam Smith, Montesquieu, Darwin, Mill, Rousseau, Spencer