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These radio versions were adapted from the original television scripts by Harold Snoad and Michael Knowles , and featured John Snagge as a newsreader , who set the scene for each episode .
 Harold Snoad, Michael Knowles, John Snagge
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:
 Harold Snoad, Michael Knowles, John Snagge