Cita APA (7th ed.)

Cawley, J., Heckman, J., & Vytlacil, E. (1998). Cognitive ability and the rising return to education. National Bureau of Economic Research.

Cita Chicago (17th ed.)

Cawley, John, James Heckman, i Edward Vytlacil. Cognitive Ability and the Rising Return to Education. Cambridge: National Bureau of Economic Research, 1998.

Cita MLA (9th ed.)

Cawley, John, et al. Cognitive Ability and the Rising Return to Education. National Bureau of Economic Research, 1998.