APA
Piehl A. M., . (1999). Testing for structural breaks in the evaluation of programs. Cambridge, Mass: National Bureau of Economic Research.
Chicago
Piehl Anne Morrison, . 1999. Testing for structural breaks in the evaluation of programs. Cambridge, Mass: National Bureau of Economic Research.
Harvard
Piehl A. M., . (1999). Testing for structural breaks in the evaluation of programs. Cambridge, Mass: National Bureau of Economic Research.
MLA
Piehl Anne Morrison, . Testing for structural breaks in the evaluation of programs. Cambridge, Mass: National Bureau of Economic Research. 1999.