APA
Finkelstein A., National Bureau of Economic Research, Gentzkow M. & Williams H. (2014). Sources of geographic variation in health care. Cambridge: NBER.
Chicago
Finkelstein Amy, National Bureau of Economic Research, Gentzkow Matthew and Williams Heidi. 2014. Sources of geographic variation in health care. Cambridge: NBER.
Harvard
Finkelstein A., National Bureau of Economic Research, Gentzkow M. and Williams H. (2014). Sources of geographic variation in health care. Cambridge: NBER.
MLA
Finkelstein Amy, National Bureau of Economic Research, Gentzkow Matthew and Williams Heidi. Sources of geographic variation in health care. Cambridge: NBER. 2014.