Costa, D. L. (1998). The evolution of retirement: An American economic history, 1880-1990. University of Chicago Press.
Lua i Stíl Chicago (17ú heag.)Costa, Dora L. The Evolution of Retirement: An American Economic History, 1880-1990. Chicago: University of Chicago Press, 1998.
Lua MLA (9ú heag.)Costa, Dora L. The Evolution of Retirement: An American Economic History, 1880-1990. University of Chicago Press, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.