APA (7th ed.) Citation

Heckman, J. J., Smith, J. A., & Taber, C. (1994). Accounting for dropouts in evaluations of social experiments.

Chicago Style (17th ed.) Citation

Heckman, James J., Jeffrey A. Smith, and Christopher Taber. Accounting for Dropouts in Evaluations of Social Experiments. Cambridge, Mass, 1994.

MLA (9th ed.) Citation

Heckman, James J., et al. Accounting for Dropouts in Evaluations of Social Experiments. 1994.