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William E. Wagner,. (2015). Using IBM SPSS statistics for research methods and social science statistics . United States of America: SAGE Publications, Inc..

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William E. Wagner,. Using IBM SPSS statistics for research methods and social science statistics. United States of America: SAGE Publications, Inc., 2015. Text.

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William E. Wagner,. Using IBM SPSS statistics for research methods and social science statistics. United States of America: SAGE Publications, Inc., 2015. Text.

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William E. Wagner,. Using IBM SPSS statistics for research methods and social science statistics. United States of America: SAGE Publications, Inc., 2015. Print.