The Fortune at the Bottom of the Pyramid
C. K. Prahalad argues that companies must revolutionize how they do business in developing countries if both sides of that economic equation are to prosper.
The bottom of the pyramid is an influential book which does not focus on social businesses per se, but suggests a positive interdependency between the private sector and the low-income communities' economic development. It might be interesting to think of this an as option. In fact, several inspirations show projects with international businesses were involved.
another interview by Prahalad: http://www.thinkers50.com/video/33