Johnson, R. B., & Christensen, L. Educational research: Quantitative, qualitative, and mixed approaches (Fifth edition.).
Citace podle Chicago (17th ed.)Johnson, R. Burke, a Larry Christensen. Educational Research: Quantitative, Qualitative, and Mixed Approaches. Fifth edition. Los Angeles : Sage Publications, c2014.
Citace podle MLA (9th ed.)Johnson, R. Burke, a Larry Christensen. Educational Research: Quantitative, Qualitative, and Mixed Approaches. Fifth edition.
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