Best textbooks/websites about exoplanets?

I need to find some really great textbooks/websites about the various different exoplanet detection methods. Wikipedia is great, but it's for an essay and I'd feel more comfortable getting my research from a variety of different sources.
I've been looking at a couple of textbooks by Sara Seager, and they look quite helpful. Are there any others people know of?
Also, any websites that are gems of information would be really useful to. It's such a wide area of science I find it easy to get lost in, so it would be great to see some structure.

Thanks for your time :)