Dyfyniad APA

Gruber, J., & Zinman, J. (2000). Youth smoking in the U.S: Evidence and implications. National Bureau of Economic Research.

Dyfyniad Arddull Chicago

Gruber, Jonathan, and Jonathan Zinman. Youth Smoking in the U.S: Evidence and Implications. Cambridge: National Bureau of Economic Research, 2000.

Dyfyniad MLA

Gruber, Jonathan, and Jonathan Zinman. Youth Smoking in the U.S: Evidence and Implications. National Bureau of Economic Research, 2000.

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