Não informado. (2002). Ziff Davis Smart Business. Ziff Davis Media.
Lua i Stíl Chicago (17ú heag.)Não informado. Ziff Davis Smart Business. San Francisco, Calif: Ziff Davis Media, 2002.
Lua MLA (8ú heag.)Não informado. Ziff Davis Smart Business. Ziff Davis Media, 2002.
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