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              WEBER, R. Basic content analysis. 2 ed. Newbury Park: SAGE, 1990.
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              Weber, R.P. (1990) Basic Content Analysis, 2nd edition. Sage University Papers: Quantitative Applications in the Social Sciences. Thousand Oaks, CA and London: SAGE.
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              Weber, Robert (1990) Basic Content Analysis. Newbury Park, CA: Sage Publications.
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              Weber, Robert Philip (1990): Basic Content Analysis. Newbury Park: Sage.
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              Weber, Robert Philip. 1990. Basic Content Analysis, 2nd ed. Newbury Park, Lon- don and New Dehli: Sage Publications.
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