1. Discovering statistics using IBM SPSS statistics Field, Andy P., London : SAGE, [2024] PSY509 PSY213 CP516 PSY510 PSY501 BUS220 BUS472
2. A simple guide to IBM SPSS statistics for version 23.0 Kirkpatrick, Lee A., 1958- Boston, Mass. : Cengage Learning, [2016] PSY509
