Symptoms and Diagnosis. Attention-Deficit / Hyperactivity Disorder (ADHD). Division of Human Development, National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention. 29. rujna 2014. Inačica izvorne stranice arhivirana 7. studenoga 2014. Pristupljeno 3. studenoga 2014.
Symptoms and Diagnosis. Attention-Deficit / Hyperactivity Disorder (ADHD). Division of Human Development, National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention. 29. rujna 2014. Inačica izvorne stranice arhivirana 7. studenoga 2014. Pristupljeno 3. studenoga 2014.