Nickels, W. G., McHugh, J. M., & McHugh, S. M. (1996). Understanding business (4th ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)Nickels, William G., James M. McHugh, agus Susan M. McHugh. Understanding Business. 4th ed. Chicago: Irwin, 1996.
Lua MLA (9ú heag.)Nickels, William G., et al. Understanding Business. 4th ed. Irwin, 1996.
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