APA
Ashraf Q. H., Weil David N, Lester Ashley & National Bureau Of Economic Research. (2008). When Does Improving Health Raise GDP?. Cambridge: NBER.
Chicago
Ashraf Quamrul H, Weil David N, Lester Ashley and National Bureau Of Economic Research. 2008. When Does Improving Health Raise GDP?. Cambridge: NBER.
Harvard
Ashraf Q. H., Weil David N, Lester Ashley and National Bureau Of Economic Research. (2008). When Does Improving Health Raise GDP?. Cambridge: NBER.
MLA
Ashraf Quamrul H, Weil David N, Lester Ashley and National Bureau Of Economic Research. When Does Improving Health Raise GDP?. Cambridge: NBER. 2008.