Cita APA (7a ed.)

Grorge, D., & Mallery, P. (2014). IBM statistics 21 step by step: A simple guide and reference (13th ed.). Pearson Education.

Cita Chicago Style (17a ed.)

Grorge, Darren, y Paul Mallery. IBM Statistics 21 Step by Step: A Simple Guide and Reference. 13th ed. U.S.A.: Pearson Education, 2014.

Cita MLA (8a ed.)

Grorge, Darren, y Paul Mallery. IBM Statistics 21 Step by Step: A Simple Guide and Reference. 13th ed. Pearson Education, 2014.