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She was nervous at the prospect of taking on a role strongly identified with Ethel Merman , anxious about appearing in an unglamorous part after breaking from juvenile parts for several years , and disturbed by her treatment at the hands of director Busby Berkeley .
 Ethel Merman, Busby Berkeley
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:
 Ethel Merman, Busby Berkeley