I'm currently taking the A2 at college. For AS, apart from the Joy Hendry books, my teacher recommended 'Small Places, Large Issues' by Thomas Hylland Eriksen. I found that pretty good.
You can actually find a lot of stuff online as well, just search the internet for the different subject content and you can usually find stuff that is helpful.
I'd also say try reading an ethnography, or some of one at least. I only did that this year, but I have found it has really helped me understand and apply a lot of the AS content.