1. White House 2015 America's College Promise: A progress report on free community college https://obamawhitehouse.archives.gov/sites/default/files/docs/progressreportoncommunitycollege.pdf
2. Bergerson , A. A. 2009 College choice and access to college: Moving policy, research, and practice to the 21st century ASHE Higher Education Report, 35
3. Accountability, affordability, access: A review of the recent trends in higher education policy research;Conner;Policy Studies Journal,2011
4. The enrollment effects of merit-based financial aid: Evidence from Georgia's HOPE Program;Cornwell;Journal of Labor Economics,2006