Fraenkel, J. R., & Wallen, N. E. (2009). How to design and evaluate research in education (7th ed.). McGraw-Hill.
Chicago-viite (17. p.)Fraenkel, Jack R., ja Norman E. Wallen. How to Design and Evaluate Research in Education. 7th ed. New York, NY: McGraw-Hill, 2009.
MLA-viite (8. p.)Fraenkel, Jack R., ja Norman E. Wallen. How to Design and Evaluate Research in Education. 7th ed. McGraw-Hill, 2009.
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