Assistance, SVP

I need to learn a bit about micro-finance and micro-business stuff. Not a whole big thing, just a few cases or exemplary works that would help me get a grasp of the subject. If there is a case of a micro-enterprise project in a refugee setting, that would be especially helpful. Thus I'm asking you, my loyal readers, for suggestions of books or articles that might be useful.

As background, I've been asked to advice to a few people I used to work with at the Buduburam Camp in Ghana, as they start a new micro-business initiative. As this isn't really my field, I'm looking for some guidance. If you know of something good, drop me a comment.

Thanks!