Avenell, A., Cook, J., Maclennan, G., & Macpherson, G. (2007). Vitamin D supplementation to prevent infections: A sub-study of a randomised placebo-controlled trial in older people (RECORD trial, ISRCTN 51647438).
芝加哥风格引文Avenell, A., J. Cook, G. Maclennan, 与 G. Macpherson. Vitamin D Supplementation to Prevent Infections: A Sub-study of a Randomised Placebo-controlled Trial in Older People (RECORD Trial, ISRCTN 51647438). 2007.
MLA引文Avenell, A., et al. Vitamin D Supplementation to Prevent Infections: A Sub-study of a Randomised Placebo-controlled Trial in Older People (RECORD Trial, ISRCTN 51647438). 2007.
警告：这些引文格式不一定是100％准确.