Cita APA (7th ed.)

Williams, J., Chaloupka, F. J., & Wechsler, H. (2001). Are there differential effects of price and policy on college students' drinking intensityn. National Bureau of Economic Research.

Cita Chicago (17th ed.)

Williams, Jenny, Frank J. Chaloupka, i Henry Wechsler. Are There Differential Effects of Price and Policy on College Students' Drinking Intensityn. Cambridge: National Bureau of Economic Research, 2001.

Cita MLA (9th ed.)

Williams, Jenny, et al. Are There Differential Effects of Price and Policy on College Students' Drinking Intensityn. National Bureau of Economic Research, 2001.