1. Worcester Polytechnic Institute WPI Global Perspective Program 2010 http://www.wpi.edu/Academics/GPP/index.html.
2. National Survey of Student Engagement 2001 http://nsse.iub.edu/html/origins.cfm.
3. P. Quinn 2003 http://www.wpi.edu/Academics/Outcomes/pqmodexec.pdf.