2 IZA Discussion Papers
IZA Discussion Paper No. 5255
substantially revised version published in: Evaluation and Program Planning, 2012, 35 (4), 481-490
IZA Discussion Paper No. 4754
substantially revised version published as 'Longer-Term Impacts of Mentoring, Educational Services, and Learning Incentives: Evidence from a Randomized Trial in the United States' in: American Economic Journal: Applied Economics, 2012, 4 (4), 121-139