एपीए उद्धरण

Chopra,P.N. (2002). Advanced economic theory. Kalyani publishers.

शिकागो स्टाइल उद्धरण

Chopra,P.N. Advanced Economic Theory. Ludhiana: Kalyani publishers, 2002.

एमएलए उद्धरण

Chopra,P.N. Advanced Economic Theory. Kalyani publishers, 2002.