Obure, M. J. (2002). Handbook for data analysis using SPSS: Mastering SPSS for windows. M & O data expert.
Tohutoru Kātū Chicago (17th ed.)Obure, Ming'ala J. Handbook for Data Analysis Using SPSS: Mastering SPSS for Windows. Nairobi: M & O data expert, 2002.
Tohutoro MLA (9th ed.)Obure, Ming'ala J. Handbook for Data Analysis Using SPSS: Mastering SPSS for Windows. M & O data expert, 2002.
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