APA
Koedel C., Betts Julian & National Bureau Of Economic Research. (2009). Value-added to what?: How a ceiling in the testing instrumen. Cambridge: NBER.
Chicago
Koedel Cory, Betts Julian and National Bureau Of Economic Research. 2009. Value-added to what?: How a ceiling in the testing instrumen. Cambridge: NBER.
Harvard
Koedel C., Betts Julian and National Bureau Of Economic Research. (2009). Value-added to what?: How a ceiling in the testing instrumen. Cambridge: NBER.
MLA
Koedel Cory, Betts Julian and National Bureau Of Economic Research. Value-added to what?: How a ceiling in the testing instrumen. Cambridge: NBER. 2009.
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