Dyfyniad APA

Rothwell, P. (2006). Factors that can affect the external validity of randomised controlled trials.

Dyfyniad Arddull Chicago

Rothwell, P. Factors That Can Affect the External Validity of Randomised Controlled Trials. 2006.

Dyfyniad MLA

Rothwell, P. Factors That Can Affect the External Validity of Randomised Controlled Trials. 2006.

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