Putnam, R. D. Bowling alone: The collapse and revival of american community. Simon and Schuster.
Lua i Stíl Chicago (17ú heag.)Putnam, Robert D. Bowling Alone: The Collapse and Revival of American Community. New York (State): Simon and Schuster.
Lua MLA (9ú heag.)Putnam, Robert D. Bowling Alone: The Collapse and Revival of American Community. Simon and Schuster.
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