Doll, R., & Hill, A. B. (1999). Smoking and carcinoma of the lung. Preliminary report. 1950. World Health Organization.
Dyfyniad Arddull ChicagoDoll, R., and A. B. Hill. Smoking and Carcinoma of the Lung. Preliminary Report. 1950. World Health Organization, 1999.
Dyfyniad MLADoll, 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.