APA
Kenkel D. S., National Bureau of Economic Research, Schmeiser M. & D Urban C. J. (2014). Is smoking inferior?. Cambridge: NBER.
Chicago
Kenkel Donald S, National Bureau of Economic Research, Schmeiser Maximilian and D Urban Carly J. 2014. Is smoking inferior?. Cambridge: NBER.
Harvard
Kenkel D. S., National Bureau of Economic Research, Schmeiser M. and D Urban C. J. (2014). Is smoking inferior?. Cambridge: NBER.
MLA
Kenkel Donald S, National Bureau of Economic Research, Schmeiser Maximilian and D Urban Carly J. Is smoking inferior?. Cambridge: NBER. 2014.