Ball, R. (1991). Quantitative approaches to management. Butterworth Heinemann.
Čikaški stil citiranja (17. izdanje)Ball, Robert. Quantitative Approaches to Management. Oxford: Butterworth Heinemann, 1991.
MLA način citiranja (9. izdanje)Ball, Robert. Quantitative Approaches to Management. Butterworth Heinemann, 1991.
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