I need resources for sexuality vs romance

[Rae]

A friend of mine is doing research on LGBTQIA for his psych class and he turned to me for help (yay)
I happily agreed but hit a bit of a stone wall in the process of gathering all my sources and information
Most of it is posted to my tumblr of almost 20,000 posts and they're all untagged because I'm dumb
The only resource that I can fully vouch for that is saved to my bookmarks is Asexuality.org
LOVE that site, but it won't be enough
So, does anyone have any websites or books or anything that can be sited and have reliable sources that I can send him?
PLEASE AND THANK YOU

(So far I have powerpoint from the Huffington Post along with Asexuality.org so all help is loved)

(also I shoved this in ChitChat since I wasn't 100% sure where to put it...)