Gaya APA

George, D., Mallery, P. (2020). IBM SPSS Statistics 26 Step by Step: A Simple Guide and Reference (Sixteenth). New York: Routledge.

Gaya MLA

George, Darren., Mallery, Paul. "IBM SPSS Statistics 26 Step by Step: A Simple Guide and Reference". Sixteenth New York: Routledge, 2020. MP.