Rothwell, P. (2006). Factors that can affect the external validity of randomised controlled trials.
芝加哥风格引文Rothwell, P. Factors That Can Affect the External Validity of Randomised Controlled Trials. 2006.
MLA引文Rothwell, P. Factors That Can Affect the External Validity of Randomised Controlled Trials. 2006.
警告：这些引文格式不一定是100％准确.