GRIFFIN, R. W., & EBERT, R. J. (1999). Business.-- Ed.5. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)GRIFFIN, Ricky W., agus Ronald J. EBERT. Business.-- Ed.5. New Jersey: Prentice-Hall, 1999.
Lua MLA (9ú heag.)GRIFFIN, Ricky W., agus Ronald J. EBERT. Business.-- Ed.5. Prentice-Hall, 1999.
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