Citazione Stile APA (7a Edizione)

Heckman, J. J., & Smith, J. A. (1997). The sensitivity of experimental impact estimates: Evidence from the national JTPA study. National Bureau of Economic Research.

Citazione stile Chigago Style (17a edizione)

Heckman, James J., e Jeffrey A. Smith. The Sensitivity of Experimental Impact Estimates: Evidence from the National JTPA Study. Cambridge: National Bureau of Economic Research, 1997.

Citatione MLA (9a ed.)

Heckman, James J., e Jeffrey A. Smith. The Sensitivity of Experimental Impact Estimates: Evidence from the National JTPA Study. National Bureau of Economic Research, 1997.