APA
Dehejia R. H., Wahba S., . (1998). Causal effects in non-experimental studies : re-evaluating the evaluation of training programs. Cambridge, Mass: National Bureau of Economic Research.
Chicago
Dehejia Rajeev H, Wahba Sadek, . 1998. Causal effects in non-experimental studies : re-evaluating the evaluation of training programs. Cambridge, Mass: National Bureau of Economic Research.
Harvard
Dehejia R. H., Wahba S., . (1998). Causal effects in non-experimental studies : re-evaluating the evaluation of training programs. Cambridge, Mass: National Bureau of Economic Research.
MLA
Dehejia Rajeev H, Wahba Sadek, . Causal effects in non-experimental studies : re-evaluating the evaluation of training programs. Cambridge, Mass: National Bureau of Economic Research. 1998.