1. Patterns of attachment: A psychological study of the strange situation;Ainsworth,1978
2. Committee on hospital care: Care of children in hospitals;American Academy of Pediatrics,1960
3. Child life services;American Academy of Pediatrics Child Life Council and Committee on Hospital Care;Pediatrics,2006
4. Human memory: A proposed system and its control processes;Atkinson,1968
5. Social learning theory;Bandura,1977