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In " The Civilizing Process " ( 1939 ) , the sociologist Norbert Elias said that manners arose as a product of group living , and persist as a way of maintaining social order .
 The Civilizing Process, Norbert Elias
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 The Civilizing Process, Norbert Elias