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Statistics
Ilersic, Alfred R., (1964)
Das Reduzieren der Zahlen : statistische Analyse und Interpretation
Ehrenberg, Andrew S. C., (1976)
Statistical methods in management
Cass, Tom, (1973)
An introduction to index numbers
Morrell, A. J. H., (1948)
Labour turnover
Morrell, A. J. H., (1955)
Statistics in theory and practice : with special reference to published statistics
Connor, L. R., (1964)