Cawley, J., Heckman, J., & Vytlacil, E. (1998). Cognitive ability and the rising return to education. National Bureau of Economic Research.
Citazione stile Chigago Style (17a edizione)Cawley, John, James Heckman, e Edward Vytlacil. Cognitive Ability and the Rising Return to Education. Cambridge: National Bureau of Economic Research, 1998.
Citatione MLA (9a ed.)Cawley, John, et al. Cognitive Ability and the Rising Return to Education. National Bureau of Economic Research, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.