Dyfyniad APA

Decker, S. L., & Schwartz, A. E. (2000). Cigarettes and alcohol: Substitutes or complementsn. National Bureau of Economic Research.

Dyfyniad Arddull Chicago

Decker, Sandra L., and Amy Ellen Schwartz. Cigarettes and Alcohol: Substitutes or Complementsn. Cambridge: National Bureau of Economic Research, 2000.

Dyfyniad MLA

Decker, Sandra L., and Amy Ellen Schwartz. Cigarettes and Alcohol: Substitutes or Complementsn. National Bureau of Economic Research, 2000.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.