GRIFFIN, R. W., & 3. (2002). Business. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)GRIFFIN, Ricky W., agus 3. Business. Prentice Hall, 2002.
Lua MLA (8ú heag.)GRIFFIN, Ricky W., agus 3. Business. Prentice Hall, 2002.
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