Leider, R., & Shapiro, D. A. (2021). Who do you want to be when you grow old?: The path of purposeful aging (First edition.). Berrett-Koehler Publishers, Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLeider, Richard, और David A. Shapiro. Who Do You Want to Be When You Grow Old?: The Path of Purposeful Aging. First edition. Oakland, CA: Berrett-Koehler Publishers, Inc., 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLeider, Richard, और David A. Shapiro. Who Do You Want to Be When You Grow Old?: The Path of Purposeful Aging. First edition. Berrett-Koehler Publishers, Inc., 2021.
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