Cita APA (7a ed.)

Heckman, J. J., & Vytlacil, E. (2000). Identifying the role of cognitive ability in explaining the level of and change in the return to schooling. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Heckman, James Joseph, y Edward Vytlacil. Identifying the Role of Cognitive Ability in Explaining the Level of and Change in the Return to Schooling. Cambridge, MA: National Bureau of Economic Research, 2000.

Cita MLA (9a ed.)

Heckman, James Joseph, y Edward Vytlacil. Identifying the Role of Cognitive Ability in Explaining the Level of and Change in the Return to Schooling. National Bureau of Economic Research, 2000.