Citazione APA

Thirkettle, G. L. (1981). Wheldon's business statistics and statistical method (Ed.9.).

Stile di citazione Chicago

Thirkettle, G L. Wheldon's Business Statistics and Statistical Method. Ed.9. London, E L B S, 1981.

Citazione MLA

Thirkettle, G L. Wheldon's Business Statistics and Statistical Method. Ed.9. 1981.