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