Sowell, E. J., & Casey, R. J. (1982). Research methods in education. Wadsworth Pub. Co..
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Chicago-čujuhus (17. p.)
Sowell, Evelyn J., juo Rita J. Casey. Research Methods in Education. Belmont, CA: Wadsworth Pub. Co., 1982.
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MLA-čujuhus (9. p.)
Sowell, Evelyn J., juo Rita J. Casey. Research Methods in Education. Wadsworth Pub. Co., 1982.
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