Thormaehlen, K. (2017). Aging gracefully: Portraits of people over 100. Chronicle Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रThormaehlen, Karsten. Aging Gracefully: Portraits of People over 100. San Francisco: Chronicle Books, 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रThormaehlen, Karsten. Aging Gracefully: Portraits of People over 100. Chronicle Books, 2017.
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