安娜·卡文 1943, 153–61. "The Big Bang." In Modern Short Stories, edited by Denys Val Baker. London: Staples & Staples, 1943. "Face of My People." Horizon IX,
随机对照试验相较于一般的区组随机法会比较麻烦,但是平衡了两组的生理特征,避免因为非试验因素而产生误差。 Beller, Elaine M.; Gebski, Val; Keech, Anthony C. Randomisation in clinical trials. The Medical Journal