Nickels, W. G., McHugh, J. M., & McHugh, S. M. (2019). Understanding business (Twelfth edition.). McGraw-Hill Education.

Nickels, William G., James M. McHugh, and Susan M. McHugh. Understanding Business. Twelfth edition. New York, NY: McGraw-Hill Education, 2019.

Nickels, William G., et al. Understanding Business. Twelfth edition. McGraw-Hill Education, 2019.