APA
Angrist J., Krueger Ab & National Bureau Of Economic Research. (1994). Split Sample Instrumental Variables. Cambridge, MA: NBER.
Chicago
Angrist JD, Krueger Ab and National Bureau Of Economic Research. 1994. Split Sample Instrumental Variables. Cambridge, MA: NBER.
Harvard
Angrist J., Krueger Ab and National Bureau Of Economic Research. (1994). Split Sample Instrumental Variables. Cambridge, MA: NBER.
MLA
Angrist JD, Krueger Ab and National Bureau Of Economic Research. Split Sample Instrumental Variables. Cambridge, MA: NBER. 1994.