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Their concept artists looked to the team 's favorite graphic novels for inspiration and the concept artwork by Ralph McQuarrie , Doug Chiang , Joe Johnston , and others who worked on the " Star Wars " films .
 Ralph McQuarrie, Doug Chiang, Joe Johnston
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ralph McQuarrie, Doug Chiang, Joe Johnston