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As of August 2012 , his latest published work is a husband-and-wife collaboration , There 's Going to Be a New Baby ( Walker Books , September 2011 ) , written by John and illustrated by Helen for " ages 2 + " .
 Books, Helen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Books, Helen