SLA/ESL book recommendation

[Steve Bialostok]

I am teaching sociolinguistics and social literacies this spring and need a book - preferably ethnographic - that examines this topic. Not necessarily (or even at all) from the school perspective. The class is a combination of upper division undergrads, masers and doc students. There are a surprising number of them who are getting their ESL endorsement, and I'd really like to have them read something beyond the standard ESL/SLA materials. Again, any ethnography would be great.

Thanks,
Steve