Cita APA (7a ed.)

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. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Heckman, James Joseph, Justin L. Tobias, y Edward Vytlacil. Simple Estimators for Treatment Parameters in a Latent Variable Framework with an Application to Estimating the Returns to Schooling. Cambridge, MA: National Bureau of Economic Research, 2000.

Cita MLA (9a ed.)

Heckman, James Joseph, et al. Simple Estimators for Treatment Parameters in a Latent Variable Framework with an Application to Estimating the Returns to Schooling. National Bureau of Economic Research, 2000.