Ball, R. (1991). Quantitative approaches to management. Butterworth Heinemann.
Chicago Style aipamenaBall, Robert. Quantitative Approaches to Management. Oxford: Butterworth Heinemann, 1991.
MLA aipamenaBall, Robert. Quantitative Approaches to Management. Butterworth Heinemann, 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.