Keller, G., Bartel, H., & Warrack, B. (1990). Statistics for management and economics: A system approach (2nd ed.). Wadsworth.
Citace podle Chicago (17th ed.)Keller, Gerald, Henry Bartel, a Brian Warrack. Statistics for Management and Economics: A System Approach. 2nd ed. Belmont, Calif: Wadsworth, 1990.
Citace podle MLA (9th ed.)Keller, Gerald, et al. Statistics for Management and Economics: A System Approach. 2nd ed. Wadsworth, 1990.
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