APA استشهاد

Dwivedi, D. (1985). Principles of economics (1st. ed.). Vikas publishing House.

استشهاد بنمط شيكاغو

Dwivedi, D.N. Principles of Economics. 1st. ed. Delhi: Vikas publishing House, 1985.

MLA استشهاد

Dwivedi, D.N. Principles of Economics. 1st. ed. Vikas publishing House, 1985.