Creating an SPSS Data File and Preparing to Analyse the DataBarton, B., & Peat, J. (2014). Creating an SPSS data file and preparing to analyse the data Medical statistics: A guide to SPSS, data analysis and critical appraisal (2nd ed., pp. 1-23). Hoboken, NJ: Wiley Blackwell.
Read Chapter 1: “Creating an SPSS Data File and Preparing to Analyse the Data”