APA
Levy D. E., Meara Ellen & National Bureau Of Economic Research. (2005). The effect of the 1998 master settlement agreement on prenatal smoking. Cambridge, MA: NBER.
Chicago
Levy Douglas E, Meara Ellen and National Bureau Of Economic Research. 2005. The effect of the 1998 master settlement agreement on prenatal smoking. Cambridge, MA: NBER.
Harvard
Levy D. E., Meara Ellen and National Bureau Of Economic Research. (2005). The effect of the 1998 master settlement agreement on prenatal smoking. Cambridge, MA: NBER.
MLA
Levy Douglas E, Meara Ellen and National Bureau Of Economic Research. The effect of the 1998 master settlement agreement on prenatal smoking. Cambridge, MA: NBER. 2005.