Hughes, D. A., & Norton, R. (2009). Vitamin D and respiratory health.
芝加哥风格引文Hughes, David A., 与 Rosemary Norton. Vitamin D and Respiratory Health. 2009.
MLA引文Hughes, David A., 与 Rosemary Norton. Vitamin D and Respiratory Health. 2009.
警告：这些引文格式不一定是100％准确.