APA
Kline P., National Bureau of Economic Research & Walters C. (2015). Evaluating public programs with close substitute. Cambridge: NBER.
Chicago
Kline Patrick, National Bureau of Economic Research and Walters Christopher. 2015. Evaluating public programs with close substitute. Cambridge: NBER.
Harvard
Kline P., National Bureau of Economic Research and Walters C. (2015). Evaluating public programs with close substitute. Cambridge: NBER.
MLA
Kline Patrick, National Bureau of Economic Research and Walters Christopher. Evaluating public programs with close substitute. Cambridge: NBER. 2015.