I have had a quick check of the ADHD site on Wikipedia, which looks quite comprehensive and reliable. Many of the media articles on ADHD are written by people with a phobia or even an irrational hatred of genetics so are quite unreliable.
Unfortunately for Master's level research we are only allowed to cite authoritative web pages in our thesis. Authoritative pages are websites of organisations who have the "final say" on a subject, such as the FDA or CDC websites. I am looking for more sites such as these that I may be missing.
"Authoritative pages are websites of organisations who have the "final say" on a subject,"
In such a contentious area as behaviour genetics, most organisations will have an agenda or bias. For example, it might be thought that Nature was an authoritative source, but last year it published an appalling book review of Plomin's book Blueprint by someone with an obvious fundamental political objection to behaviour genetics. At least with Wikipedia anyone can correct it.