Costa, D. L. (1998). The evolution of retirement: An American economic history, 1880-1990. University of Chicago Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCosta, Dora L. The Evolution of Retirement: An American Economic History, 1880-1990. Chicago: University of Chicago Press, 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCosta, Dora L. The Evolution of Retirement: An American Economic History, 1880-1990. University of Chicago Press, 1998.
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