109738
The broad theoretical framework for current versions of RAD is attachment theory , based on work conducted from the 1940 s to the 1980 s by John Bowlby , Mary Ainsworth and René Spitz .
 John Bowlby, Mary Ainsworth, René Spitz
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:
 John Bowlby, Mary Ainsworth, René Spitz