All those sources share is what domain location is for where someone read the article. For instance if found with search on Google contrast read at Hubpages. There are many different Google domains like I have activity at Google United Kingdom (Google.co.UK) BTW . . . it is an automatic function that HP does for you.
If you are showing views at your main account page you should have views at the Source Page too. At the Sources Page they are sorted in rank by EVER views. You can sort by the other columns by clicking on the column header icon. At the Main Account page they are sorted by 7-Day or 30-Day. I don't remember.
I hope that helps . . .