Nickels, W. G., McHugh, J. M., & McHugh, S. M. (2016). Understanding business (Eleventh edition.). McGraw-Hill Education.
Lua i Stíl Chicago (17ú heag.)Nickels, William G., James M. McHugh, agus Susan M. McHugh. Understanding Business. Eleventh edition. New York, NY: McGraw-Hill Education, 2016.
Lua MLA (8ú heag.)Nickels, William G., et al. Understanding Business. Eleventh edition. McGraw-Hill Education, 2016.
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