Leadership and performance outcomes in research organizations: The supervisor of scientists as a source of assistance

Convergent and discriminant validation by the multitrait-multimethod matrix.

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A Theory of Leadership Effectiveness

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A Theory of Leadership Effectiveness.

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Unobtrusive Measures: Nonreactive Research in the Social Sciences

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Psychological Statistics.

Leo Katz, Quinn McNemar · Journal of the American Statistical Association · 1963 · 991 citations