World Helalth Organization. (2007). Global age-friendly cities: A guide. World Health Organization.
芝加哥风格引文World Helalth Organization. Global Age-friendly Cities: A Guide. Geneva: World Health Organization, 2007.
MLA引文World Helalth Organization. Global Age-friendly Cities: A Guide. World Health Organization, 2007.
警告：这些引文格式不一定是100％准确.