Gelfand, D. E. (1982). Aging: The ethnic factor. Little, Brown.
Lua i Stíl Chicago (17ú heag.)Gelfand, Donald E. Aging: The Ethnic Factor. Little, Brown, 1982.
Lua MLA (9ú heag.)Gelfand, Donald E. Aging: The Ethnic Factor. Little, Brown, 1982.
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