APA استشهاد

Lipsey, R. G., & Chrystal, K. A. (2002). Principles of Economics (ed.9.). Oxford University Press.

استشهاد بنمط شيكاغو

Lipsey, Richard G., و K. Alec Chrystal. Principles of Economics. ed.9. New Delhi: Oxford University Press, 2002.

MLA استشهاد

Lipsey, Richard G., و K. Alec Chrystal. Principles of Economics. ed.9. Oxford University Press, 2002.