Lee, R. – Lee, S. H. – Mason, A. (2006): Charting the Economic Life Cycle. NBER, NBER Working Paper No. 12379, July 2006.

Meng, H. – Friedman, B. – Dick, Andrew W. – Wamsley, Brenda R. et al (2006): Effect of a Voucher Benefit on the Demand for Paid Personal Assistance. The Gerontologist; Apr 2006; 46, 2; pg. 183.

Riesmkamp, J. – Busemeyer, J. R. – Mellers, B. A. (2006): Extending the Bounds of Rationality: Evidence and Theories of Preferential Choice. Journal of Economic Literature, vol. XLVI, September 2006, No. 3, s. 631–661.