2 IZA Discussion Papers
IZA Discussion Paper No. 7508
published in: Journal of Human Resources, 2017, 52 (4), 1032-1059.
IZA Discussion Paper No. 4968
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