Nickels, W. G. (1999). Understanding business [ada disket]. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Nickels, William G. Understanding Business [ada Disket]. McGraw-Hill, 1999.
Lua MLA (8ú heag.)Nickels, William G. Understanding Business [ada Disket]. McGraw-Hill, 1999.
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