Dyfyniad APA

(1981). Confounding and selection bias in case control studies / Roderick J.A. Little, Paul R. Rosenbaum.

Dyfyniad Arddull Chicago

Confounding and Selection Bias in Case Control Studies / Roderick J.A. Little, Paul R. Rosenbaum. 1981.

Dyfyniad MLA

Confounding and Selection Bias in Case Control Studies / Roderick J.A. Little, Paul R. Rosenbaum. 1981.

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