Nickels, W., McHugh, J., & McHugh, S. M. (2002). Understanding business (6th ed.). McGraw-hill..
Lua i Stíl Chicago (17ú heag.)Nickels, William, James McHugh, agus Susan M. McHugh. Understanding Business. 6th ed. Boston: McGraw-hill., 2002.
Lua MLA (9ú heag.)Nickels, William, et al. Understanding Business. 6th ed. McGraw-hill., 2002.
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