Fraenkel, J. R., & Wallen, N. E. (1996). How to design and evaluate research in education (3rd ed.). McGraw-Hill.
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Chicago-čujuhus (17. p.)
Fraenkel, Jack R., juo Norman E. Wallen. How to Design and Evaluate Research in Education. 3rd ed. New York: McGraw-Hill, 1996.
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MLA-čujuhus (9. p.)
Fraenkel, Jack R., juo Norman E. Wallen. How to Design and Evaluate Research in Education. 3rd ed. McGraw-Hill, 1996.
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