Naiman, A., Rosenfield, R., & Zirkel, G. (1996). Understanding statistics (4th ed.). McGraw-Hill.
Cita Chicago (17th ed.)Naiman, Arnold, Robert Rosenfield, i Gene Zirkel. Understanding Statistics. 4th ed. New York: McGraw-Hill, 1996.
Cita MLA (9th ed.)Naiman, Arnold, et al. Understanding Statistics. 4th ed. McGraw-Hill, 1996.
Atenció: Aquestes cites poden no estar 100% correctes.