Thirkettle, G. (1962). Wheldon's business statistics and statistical method/5e: Wheldon revised (5th ed.). Macdonald & Evans.
Dyfyniad Arddull ChicagoThirkettle, G.L. Wheldon's Business Statistics and Statistical Method/5e: Wheldon Revised. 5th ed. London: Macdonald & Evans, 1962.
Dyfyniad MLAThirkettle, G.L. Wheldon's Business Statistics and Statistical Method/5e: Wheldon Revised. 5th ed. Macdonald & Evans, 1962.
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