APA
Barro J. R., Chu Michael & National Bureau Of Economic Research. (2002). HMO penetration, ownership status, and the rise of hospital advertising. Cambridge, MA: NBER.
Chicago
Barro Jason R, Chu Michael and National Bureau Of Economic Research. 2002. HMO penetration, ownership status, and the rise of hospital advertising. Cambridge, MA: NBER.
Harvard
Barro J. R., Chu Michael and National Bureau Of Economic Research. (2002). HMO penetration, ownership status, and the rise of hospital advertising. Cambridge, MA: NBER.
MLA
Barro Jason R, Chu Michael and National Bureau Of Economic Research. HMO penetration, ownership status, and the rise of hospital advertising. Cambridge, MA: NBER. 2002.