Subject encyclopedias are useful for obtaining overviews of topics in a particular subject area or field of study. The following titles are recommended sources:
The New Palgrave Dictionary of Economics
This is the Living Edition (dynamic online version) of The New Palgrave Dictionary of Economics. Written by leading figures in the field including many Nobel prize winners, this is the definitive scholarly reference work for a new generation of economists. Regularly updated!
Encyclopedia of Emerging Markets by 
The Princeton Encyclopedia of the World Economy
