Heckman, J. J., Tobias, J. L., & Vytlacil, E. (2000). Simple estimators for treatment parameters in a latent variable framework with an application to estimating the returns to schooling. NBER.
Chicago Style (17th ed.) CitationHeckman, James J., Justin L. Tobias, and Edward Vytlacil. Simple Estimators for Treatment Parameters in a Latent Variable Framework with an Application to Estimating the Returns to Schooling. Cambridge, Mass: NBER, 2000.
MLA (9th ed.) CitationHeckman, James J., et al. Simple Estimators for Treatment Parameters in a Latent Variable Framework with an Application to Estimating the Returns to Schooling. NBER, 2000.
Warning: These citations may not always be 100% accurate.