What has the author Darren George written?

Darren George has written:

'SPSS for Windows step by step' -- subject(s): Computer programs, SPSS (Computer file), SPSS for Windows, Social Sciences, Social sciences xStatistical methods, Statistical methods

'SPSS for Windows step by step' -- subject(s): Statistical methods, SPSS for Windows, Social sciences, Computer programs

'SPSS/PC+ step by step'