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Fraenkel, J. R., Wallen, N. E., & Hyun, H. H. (2012). How to design and evaluate research in education (8th ed.). New York, NY: The McGraw-Hill Companies.
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Fraenkel, J., Wallen, N., & Hyun, H. (2011). How to Design and Evaluate Research in Education. McGraw-Hill Education.
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Fraenkel, J.R., Wallen,N.E & Hyun, H.H. (2012). How to Design and Evaluate Research in Education. McGraw-Hill.
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Fraenkel, J.R., Wallen,N.E & Hyun, H.H. How to Design and Evaluate Research in Education. McGraw-Hill.2012.
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