Dyfyniad APA

Doll, R., & Peto, R. (1980). Randomised controlled trials and retrospective controls.

Dyfyniad Arddull Chicago

Doll, R., and R. Peto. Randomised Controlled Trials and Retrospective Controls. 1980.

Dyfyniad MLA

Doll, R., and R. Peto. Randomised Controlled Trials and Retrospective Controls. 1980.

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