Dyfyniad APA

Doll, R., & Hill, A. B. (1999). Smoking and carcinoma of the lung. Preliminary report. 1950. World Health Organization.

Dyfyniad Arddull Chicago

Doll, R., and A. B. Hill. Smoking and Carcinoma of the Lung. Preliminary Report. 1950. World Health Organization, 1999.

Dyfyniad MLA

Doll, R., and A. B. Hill. Smoking and Carcinoma of the Lung. Preliminary Report. 1950. World Health Organization, 1999.

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