Wheldon, H. J. (1981). Wheldon's business statistics and statistical method: [by]G. L. Thirkettle. ELBS.
Lua i Stíl Chicago (17ú heag.)Wheldon, Harold James. Wheldon's Business Statistics and Statistical Method: [by]G. L. Thirkettle. [London]: ELBS, 1981.
Lua MLA (9ú heag.)Wheldon, Harold James. Wheldon's Business Statistics and Statistical Method: [by]G. L. Thirkettle. ELBS, 1981.
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