Fraenkel, J. R., Hyun, H. H., & Wallen, N. E. (2011). How to design and evaluate research in education (8th ed.). New York: McGraw-Hill Humanities/Social Sciences/Languages.
Chicago-tyylinen lähdeviittausFraenkel, Jack R., Helen H. Hyun, ja Norman E. Wallen. How to Design and Evaluate Research in Education. 8th ed. New York: McGraw-Hill Humanities/Social Sciences/Languages, 2011.
MLA-viiteFraenkel, Jack R., Helen H. Hyun, ja Norman E. Wallen. How to Design and Evaluate Research in Education. 8th ed. New York: McGraw-Hill Humanities/Social Sciences/Languages, 2011.
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