1. The late talker. What to do if your child isn't talking yet;Agin,2004
2. Wie viel Mutter braucht ein Kind?;Ahnert,2010
3. Patterns of attachment: A psychological study of the strange situation;Ainsworth,1978
4. Applied behaviour analysis for teachers;Alberto,2003
5. Diagnostic and statistical manual of mental disorders;American Psychiatric Association,2013