APA
Currie J., Thomas Duncan & National Bureau Of Economic Research. (1998). School quality and the longer-term effects of head start. Cambridge, MA: NBER.
Chicago
Currie Janet, Thomas Duncan and National Bureau Of Economic Research. 1998. School quality and the longer-term effects of head start. Cambridge, MA: NBER.
Harvard
Currie J., Thomas Duncan and National Bureau Of Economic Research. (1998). School quality and the longer-term effects of head start. Cambridge, MA: NBER.
MLA
Currie Janet, Thomas Duncan and National Bureau Of Economic Research. School quality and the longer-term effects of head start. Cambridge, MA: NBER. 1998.