APA
Royer H., National Bureau of Economic Research, Stehr M. F. & Sydnor J. R. (2012). Incentives, commitments and habit formation in exercise. Cambridge: NBER.
Chicago
Royer Heather, National Bureau of Economic Research, Stehr Mark F and Sydnor Justin R. 2012. Incentives, commitments and habit formation in exercise. Cambridge: NBER.
Harvard
Royer H., National Bureau of Economic Research, Stehr M. F. and Sydnor J. R. (2012). Incentives, commitments and habit formation in exercise. Cambridge: NBER.
MLA
Royer Heather, National Bureau of Economic Research, Stehr Mark F and Sydnor Justin R. Incentives, commitments and habit formation in exercise. Cambridge: NBER. 2012.