Nickels, W. G. (1996). Understanding business. Times Mirror Higher Education Group, Inc.
Lua i Stíl Chicago (17ú heag.)Nickels, William G. Understanding Business. Chicago: Times Mirror Higher Education Group, Inc, 1996.
Lua MLA (9ú heag.)Nickels, William G. Understanding Business. Times Mirror Higher Education Group, Inc, 1996.
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