Gaya APA

Thirkettle, G, , , , , L. (1968). Wheldon s business statistics and statistical method (1968). : London: McDonald & Evans,Ltd.,.

Gaya MLA

Thirkettle, G, , , , , L. "Wheldon s business statistics and statistical method". 1968 : London: McDonald & Evans,Ltd.,, 1968. Text.