1. Alvarez-Cuadrado, F., & Poschke, M. (2011). Structural change out of agriculture: Labor push versus labor pull. American Economic Journal: Macroeconomics, 3(3), 127–158.
2. Bishop, J. (1997). Is an oversupply of college graduates coming? NCPI – National Center for Postsecondary Improvement (508 CERAS).
3. Bishop, J., & Carter, S. (1991). The worsening shortage of college-graduate workers. Educational Evaluation and Policy Analysis, 13, 221–246.
4. Bresson, G., Hsiao, C., & Pirotte, A. (2006). Heteroskedasticity and random coefficient model on panel data (No. 0601). .
5. Briscoe, G., & Wilson, R. (2003). Modelling UK occupational employment. International Journal of Manpower, 24(5), 568–589.