APA استشهاد

Lipsey, R. G. (1999). Principles of economics (9th ed.). Oxford university Press.

استشهاد بنمط شيكاغو

Lipsey, Richard G. Principles of Economics. 9th ed. New Delhi: Oxford university Press, 1999.

MLA استشهاد

Lipsey, Richard G. Principles of Economics. 9th ed. Oxford university Press, 1999.