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Field, A.P., Field, A.P.: Chapter 1, Section 1.6.4. Chapter 2, Sections 2.5 to 2.6. In: Discovering statistics using IBM SPSS statistics. SAGE Publications, London (2018).
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Salkind, N.J.: Chapter 7 to Chapter 10. In: Statistics for people who (think they) hate statistics. SAGE, Thousand Oaks, CA.
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Field, A.P., Field, A.P.: Chapter 5, Section 5.3.2. Chapter 6, Section 6.4. Chapter 9, Section 9.5. In: Discovering statistics using IBM SPSS statistics. SAGE Publications, London (2018).
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