Cita APA (7a ed.)

Heckman, J. J. (1998). Characterizing selection bias using experimental data. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Heckman, James Joseph. Characterizing Selection Bias Using Experimental Data. Cambridge, MA: National Bureau of Economic Research, 1998.

Cita MLA (9a ed.)

Heckman, James Joseph. Characterizing Selection Bias Using Experimental Data. National Bureau of Economic Research, 1998.