Shell, G. R. (2006). Bargaining for Advantage (2nd.). Penguin.
Lua i Stíl Chicago (17ú heag.)Shell, G. Richard. Bargaining for Advantage. 2nd. New York: Penguin, 2006.
Lua MLA (9ú heag.)Shell, G. Richard. Bargaining for Advantage. 2nd. Penguin, 2006.
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