Economics
1. Alternative Microeconomics by Reynolds (CC-BY)
2. Basic Microeconomics by Reynolds (CC-BY-NC-SA)
3. Econometrics by Hansen (Custom License)
4. Economics by Boundless (CC-BY-SA)
5. Financial Analysis by Petroff (CC-BY-NC-SA)
6. International Economics : theory and practice by Suranovic (Custom License)
7. International Finance : theory and practice by Suranovic (Custom License)
8. International Trade : theory and practice by Suranovic (Custom License)
9. Political Economics by Wikipedia (CC-BY-SA)
10. Principles of Macro Economics by Taylor, et.al. (CC-BY)