Keller, G., Bartel, H., & Warrack, B. (1988). Statistics for management and economics: A systematic approach. Wadsworth Pub. Co.
Lua i Stíl Chicago (17ú heag.)Keller, Gerald, Henry Bartel, agus Brian Warrack. Statistics for Management and Economics: A Systematic Approach. Belmont, Calif: Wadsworth Pub. Co, 1988.
Lua MLA (9ú heag.)Keller, Gerald, et al. Statistics for Management and Economics: A Systematic Approach. Wadsworth Pub. Co, 1988.
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