Keller, G., & Warrack, B. (1994). Essentials of business statistics (2nd ed.). Duxbury Press.
Citace podle Chicago (17th ed.)Keller, Gerald, a Brian Warrack. Essentials of Business Statistics. 2nd ed. Belmont, California: Duxbury Press, 1994.
Citace podle MLA (9th ed.)Keller, Gerald, a Brian Warrack. Essentials of Business Statistics. 2nd ed. Duxbury Press, 1994.
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