Michalopoulos, Charles, David Card, Lisa A. Gennetian, Kristen Harknett, and Philip K. Robins (2000). The Self-Sufficiency Project at 36 months: Effects of a financial work incentive on employment and income, Ottawa: SRDC. Available at https://www.mdrc.org/publication/self-sufficiency-project-36-months-effects-financial-work-incentive-employment-and.