Encyclopedia Of Social Work
Oxford University Press / Oxford Digital Reference Shelf.
Available online. (W&L subscription)
Created by the National Association of Social Workers, this 20th edition (2008) is a four-volume set, containing about 400 articles which "cover all aspects of social, work from practice and interventions, social environments, social conditions and challenges, to social policy and history."
Links will be maintained in various locations in our Web site, including here.