Advance Care Planning: Health Care Directives. National Institute on Aging.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAdvance Care Planning: Health Care Directives. National Institute on Aging.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAdvance Care Planning: Health Care Directives. National Institute on Aging.
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