APA-viite

WHO(world health organization). (2005). Healthy ageing: Practical pointers on keeping well. WHO.

Chicago-tyylinen lähdeviittaus

WHO(world health organization). Healthy Ageing: Practical Pointers on Keeping Well. Geneva: WHO, 2005.

MLA-viite

WHO(world health organization). Healthy Ageing: Practical Pointers on Keeping Well. WHO, 2005.

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