Παραπομπή APA

Thirkettle, G. L. (1981). Wheldon's business statistics (9th ed.). Estover: Macdonald and Evans.

Παραπομπή Chicago Style

Thirkettle, G. L. Wheldon's Business Statistics. 9th ed. Estover: Macdonald and Evans, 1981.

Παραπομπή MLA

Thirkettle, G. L. Wheldon's Business Statistics. 9th ed. Estover: Macdonald and Evans, 1981.

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