World Health Organization. (1999). Sexually transmitted infections prevalence study methodology. World Health Organization.
芝加哥风格引文World Health Organization. Sexually Transmitted Infections Prevalence Study Methodology. Geneva,Switzerland: World Health Organization, 1999.
MLA引文World Health Organization. Sexually Transmitted Infections Prevalence Study Methodology. World Health Organization, 1999.
警告：这些引文格式不一定是100％准确.