Many international organizations' research & publications will come up in a Google Scholar or a regular Google search, but sometimes it may be useful to go to the organization's repository directly:
Provides online access to abstracts and full-text articles on public policy research and analysis from think tanks, university research programs, research organizations and publishers.Covers a wide range of topics.
Find the country you're researching on the World Bank website and connect with a country profile, statistics, a summary of World Bank activities in the country, and links to World Bank research on this country.
Organisation for Economic Co-operation and Development (OECD) Economic Surveys
OECD’s periodic reviews of member and non-member economies -- providing comprehensive analysis of developments in the subject country, along with individual chapters covering key economic challenges being faced and recommendations for dealing with the challenges. For this class, it may also be useful to search/browse the OECD iLibrary by Topic-->Development.