I want to find information about biological and social factors of ADHD?
Start with the Psychology Library Guide: http://library.uhd.edu/psychology
Begin your search with either PsycINFO or PsycARTICLES. Try searching in the database with different combinations of these terms:
“attention deficit hyperactivity disorder”
“Attention Deficit Disorder with Hyperactivity”
Biolog* (the * will search biology and biological)