What are these sources?
Rollins doesn't have access to the perfect database to find journal articles in economics. Here are links to databases that include a lot of economics, business and public policy journal, magazine, and newspaper articles on relevant topics amongst a lot of other subjects.
Economic, Business, and Public Policy Article Databases
These databases contain a lot of political science or public policy materials.
Other Useful Article Databases
Google Scholar has all the power (and problems) of Google, but only searches the educational materials in Google. There are diamonds amongst the dirt out there, so it is worth searching. But don't be surprised if the fulltext is not available and you are asked to pay for content. Don't, we can get it for you free via Interlibrary Loan.