World Helalth Organization. (2007). Global age-friendly cities: A guide. World Health Organization.
Chicagoスタイル(17版)引用形式World Helalth Organization. Global Age-friendly Cities: A Guide. Geneva: World Health Organization, 2007.
MLA(8版)引用形式World Helalth Organization. Global Age-friendly Cities: A Guide. World Health Organization, 2007.
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