Esty, K. C. (2019). Eightysomethings: A practical guide to letting go, aging well, and finding unexpected happiness. Skyhorse Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEsty, Katharine C. Eightysomethings: A Practical Guide to Letting Go, Aging Well, and Finding Unexpected Happiness. New York, NY: Skyhorse Publishing, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEsty, Katharine C. Eightysomethings: A Practical Guide to Letting Go, Aging Well, and Finding Unexpected Happiness. Skyhorse Publishing, 2019.
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