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The series of 29 children 's novels was written ( one co-written ) by Donald J. Sobol , with the first book published in 1963 and the last novel published posthumously in 2012 .
 Donald J. Sobol
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:
 Donald J. Sobol