Heise, D. R. & Bohrnstedt, G. W. (1970): Validity, invalidity, and reliabiity. In: Borgatta, E. F. & Bohrnstedt, G. W. (eds.). Sociological Methodology. San Francisco: Jossey-Bass.
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Heise, David. R.; Bohrnstedt, George W. 1970: Validity, Invalidity and Reliability. In: Sociological Methodology Vol. 2, S. 104-129.
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Heise, D. R., Bohrnstedt, G. W. (1970). Validity, Invalidity and Reliability. San Francisco: Jossey-Bass. Sociological Methodology, 2 pp. 104-129.
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