APA
Joyce T. J., Yunzal Butler Cristina, Racine Andrew D & National Bureau Of Economic Research. (2009). Maternal smoking and the timing of WIC enrollment. Cambridge: NBER.
Chicago
Joyce Theodore J, Yunzal Butler Cristina, Racine Andrew D and National Bureau Of Economic Research. 2009. Maternal smoking and the timing of WIC enrollment. Cambridge: NBER.
Harvard
Joyce T. J., Yunzal Butler Cristina, Racine Andrew D and National Bureau Of Economic Research. (2009). Maternal smoking and the timing of WIC enrollment. Cambridge: NBER.
MLA
Joyce Theodore J, Yunzal Butler Cristina, Racine Andrew D and National Bureau Of Economic Research. Maternal smoking and the timing of WIC enrollment. Cambridge: NBER. 2009.
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