May 2010
IZA DP No. 4968: Mentoring, Educational Services, and Economic Incentives: Longer-Term Evidence on Risky Behaviors from a Randomized Trial
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