एपीए उद्धरण

Tonya Trappe, G. T. (2009). Intelligent business coursebook upper intermadiate.

शिकागो स्टाइल उद्धरण

Tonya Trappe, Graham Tullis. Intelligent Business Coursebook Upper Intermadiate. 2009.

एमएलए उद्धरण

Tonya Trappe, Graham Tullis. Intelligent Business Coursebook Upper Intermadiate. 2009.