Mertens, D. M. (2015). Research and evaluation in education and psychology: Integrating diversity with quantitative, qualitative, and mixed methods (4 edition.). SAGE.
Lua i Stíl Chicago (17ú heag.)Mertens, Donna M. Research and Evaluation in Education and Psychology: Integrating Diversity with Quantitative, Qualitative, and Mixed Methods. 4 edition. Los Angeles: SAGE, 2015.
Lua MLA (9ú heag.)Mertens, Donna M. Research and Evaluation in Education and Psychology: Integrating Diversity with Quantitative, Qualitative, and Mixed Methods. 4 edition. SAGE, 2015.
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