Oxford business English : business, grammar and practice.

MLA

Duckworth, Michael. Oxford Business English : Business, Grammar and Practice. Oxford: University Press., n.d.

APA

Duckworth, M. (n.d). Oxford business English : business, grammar and practice. Oxford: University Press.

Chicago

Duckworth, Michael, Oxford Business English: Business, Grammar and Practice. Oxford: University Press., n.d.