APA استشهاد

Ferguson, C. E., & Kreps, J. M. (1968). Principles of economics. Oxford IBH.

استشهاد بنمط شيكاغو

Ferguson, C E., و Juanita M. Kreps. Principles of Economics. Calcutta: Oxford IBH, 1968.

MLA استشهاد

Ferguson, C E., و Juanita M. Kreps. Principles of Economics. Oxford IBH, 1968.