1. National Research Council, Rising Above the Gathering Storm: Energizing and Employing America for a Brighter Future (National Research Council, Washington, DC, 2005).
2. Data obtained through WebCASPAR (http://caspar.nsf.gov/).
3. National Center for Educational Statistics, User's Manual: National Education Longitudinal Study of 1988 (NCES, Washington, DC, 2004).
4. Rock D. A., Pollack J. M., “Psychometric report for the NELS:88 base test battery” (Tech. Rep. NCES 91–468, National Center for Educational Statistics, Washington, DC, 1991).
5. Hativa N., Marincovich M., Disciplinary Differences in Teaching and Learning: Implications for Practice (Jossey-Bass, San Francisco, CA, 1995).