Thirkettle, G. L. (1981). Wheldon's business statistics and statistical method (Ed.9.).
Chicago Edition CitationThirkettle, G L. Wheldon's Business Statistics and Statistical Method. Ed.9. London, E L B S, 1981.
MLA citiranjeThirkettle, G L. Wheldon's Business Statistics and Statistical Method. Ed.9. 1981.
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