When you are logged into your Google Analytics, click the "Standard Reporting" tab on top.
Then click "Traffic Sources" in the left-hand column to open more options. From there you can click "Sources -> All Traffic" to see where your traffic is coming from.
I suggest you also click "Overview" - which will show you the keywords people use to get to your pages.
Another useful (and new) Analytics tool that gives you the information is the real time view...
Click the "Home" tab on top and then click "Real-time -> Overview".
You will be able to watch visitors as they read your hubs and click from one hub to another. This is a great tool for observing how long people actually stay on each page. It also shows what keywords each live visitor used to get to your hub and where they came from.
It's helpful to block your own IP address so you don't end up watching yourself. You do that with the filters under the "admin" tab.