Webb, E. T., Campbell, D. T., Schwartz, R. D., Sechrest, L., & Grove, J. B. (1981). Nonreactive measures in the social sciences (2nd ed.). Houghton Mifflin.
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Tohutoru Kātū Chicago (17th ed.)
Webb, Eugene T., Donald T. Campbell, Richard D. Schwartz, Lee Sechrest, me Janet Belew Grove. Nonreactive Measures in the Social Sciences. 2nd ed. London: Houghton Mifflin, 1981.
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Tohutoro MLA (9th ed.)
Webb, Eugene T., et al. Nonreactive Measures in the Social Sciences. 2nd ed. Houghton Mifflin, 1981.
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