G. Nickels, W., M. McHugh, J., & M. McHugh, S. (1993). Understanding Business, 3rd ed. McGraw-Hill.
Cita Chicago (17th ed.)G. Nickels, William, James M. McHugh, i Susan M. McHugh. Understanding Business, 3rd Ed. New York: McGraw-Hill, 1993.
Cita MLA (9th ed.)G. Nickels, William, et al. Understanding Business, 3rd Ed. McGraw-Hill, 1993.
Atenció: Aquestes cites poden no estar 100% correctes.