World Health Organization. (2000). Healthy ageing development. World Health Organization.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWorld Health Organization. Healthy Ageing Development. Geneva: World Health Organization, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWorld Health Organization. Healthy Ageing Development. World Health Organization, 2000.
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