Grorge, D., & Mallery, P. (2014). IBM statistics 21 step by step: A simple guide and reference (13th ed.). Pearson Education.
Citação do estilo Chicago (17ª ed.)Grorge, Darren, e Paul Mallery. IBM Statistics 21 Step by Step: A Simple Guide and Reference. 13th ed. U.S.A.: Pearson Education, 2014.
Citação MLA (8ª ed.)Grorge, Darren, e Paul Mallery. IBM Statistics 21 Step by Step: A Simple Guide and Reference. 13th ed. Pearson Education, 2014.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.