Books like Attachment Theory
Arietta Slade, Jeremy Holmes
Attachment Theory is 2,416 pages, about 44 hours 18 minutes at 250 words a minute.
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How long each takes
Attached 5.4 h 
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Development Across the Life Span 13.6 h 
Human Development 13.2 h 
Mother Hunger 4.6 h 
John Bowlby and Attachment Theory 5.0 h Bar height shows length. Estimated at 250 words a minute.