एपीए उद्धरण

(2008). English for sales and purchasing (Kèm theo CD/ 825-26).

शिकागो स्टाइल उद्धरण

English for Sales and Purchasing (Kèm Theo CD/ 825-26). 2008.

एमएलए उद्धरण

English for Sales and Purchasing (Kèm Theo CD/ 825-26). 2008.