Schmahl, W. (1989). Redefining the process of retirement: An international perspective. Springer-Verlag.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSchmahl, Winfried. Redefining the Process of Retirement: An International Perspective. Berlin: Springer-Verlag, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSchmahl, Winfried. Redefining the Process of Retirement: An International Perspective. Springer-Verlag, 1989.
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