APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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