APA استشهاد

Nichols, D. A., & Reynolds, C. W. (1971). Principles of economics. Hot, Rinehart and Winston.

استشهاد بنمط شيكاغو

Nichols, Donald A., و Clark W. Reynolds. Principles of Economics. New York: Hot, Rinehart and Winston, 1971.

MLA استشهاد

Nichols, Donald A., و Clark W. Reynolds. Principles of Economics. Hot, Rinehart and Winston, 1971.