APA استشهاد

Chopra, P. (1972). Pricing, distribution, welfare. Kalyani.

استشهاد بنمط شيكاغو

Chopra, P.N. Pricing, Distribution, Welfare. Ludhiana: Kalyani, 1972.

MLA استشهاد

Chopra, P.N. Pricing, Distribution, Welfare. Kalyani, 1972.